| Base | Representation |
|---|---|
| bin | 100110000101101… |
| … | …101100110000000 |
| 3 | 1122112110011200000 |
| 4 | 212011231212000 |
| 5 | 2302043003210 |
| 6 | 143224400000 |
| 7 | 21556452060 |
| oct | 4605554600 |
| 9 | 1575404600 |
| 10 | 639031680 |
| 11 | 2a8797a61 |
| 12 | 15a016000 |
| 13 | a2513771 |
| 14 | 60c273a0 |
| 15 | 3b17cac0 |
| hex | 2616d980 |
639031680 has 384 divisors, whose sum is σ = 2619751680. Its totient is φ = 145815552.
The previous prime is 639031663. The next prime is 639031697. The reversal of 639031680 is 86130936.
It is a happy number.
639031680 is a `hidden beast` number, since 639 + 0 + 3 + 16 + 8 + 0 = 666.
It is an interprime number because it is at equal distance from previous prime (639031663) and next prime (639031697).
It is a tau number, because it is divible by the number of its divisors (384).
It is a super-2 number, since 2×6390316802 = 816722976087244800, 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 an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1088347 + ... + 1088933.
It is an arithmetic number, because the mean of its divisors is an integer number (6822270).
Almost surely, 2639031680 is an apocalyptic number.
639031680 is a gapful number since it is divisible by the number (60) 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 639031680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1309875840).
639031680 is an abundant number, since it is smaller than the sum of its proper divisors (1980720000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
639031680 is an equidigital number, since it uses as much as digits as its factorization.
639031680 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 628 (or 604 counting only the distinct ones).
The product of its (nonzero) digits is 23328, while the sum is 36.
The square root of 639031680 is about 25279.0759324782. The cubic root of 639031680 is about 861.3390353428.
The spelling of 639031680 in words is "six hundred thirty-nine million, thirty-one thousand, six hundred eighty".
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