| Base | Representation |
|---|---|
| bin | 11111001010010… |
| … | …00010101000000 |
| 3 | 200012212001222100 |
| 4 | 33211020111000 |
| 5 | 1013404013210 |
| 6 | 41534310400 |
| 7 | 6322535604 |
| oct | 1745102500 |
| 9 | 605761870 |
| 10 | 261391680 |
| 11 | 124604490 |
| 12 | 73658400 |
| 13 | 42200844 |
| 14 | 26a03504 |
| 15 | 17e345c0 |
| hex | f948540 |
261391680 has 336 divisors, whose sum is σ = 1011838464. Its totient is φ = 61378560.
The previous prime is 261391679. The next prime is 261391681. The reversal of 261391680 is 86193162.
261391680 is a `hidden beast` number, since 261 + 391 + 6 + 8 + 0 = 666.
It is an interprime number because it is at equal distance from previous prime (261391679) and next prime (261391681).
It is a super-2 number, since 2×2613916802 = 136651220746444800, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (261391681) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1172049 + ... + 1172271.
It is an arithmetic number, because the mean of its divisors is an integer number (3011424).
Almost surely, 2261391680 is an apocalyptic number.
261391680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 261391680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505919232).
261391680 is an abundant number, since it is smaller than the sum of its proper divisors (750446784).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
261391680 is a wasteful number, since it uses less digits than its factorization.
261391680 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 294 (or 281 counting only the distinct ones).
The product of its (nonzero) digits is 15552, while the sum is 36.
The square root of 261391680 is about 16167.6120685771. The cubic root of 261391680 is about 639.3871737978.
The spelling of 261391680 in words is "two hundred sixty-one million, three hundred ninety-one thousand, six hundred eighty".
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