| Base | Representation |
|---|---|
| bin | 100111100111101… |
| … | …010001011000100 |
| 3 | 1201022202122122200 |
| 4 | 213213222023010 |
| 5 | 2330131122110 |
| 6 | 145542554500 |
| 7 | 22320631362 |
| oct | 4747521304 |
| 9 | 1638678580 |
| 10 | 664707780 |
| 11 | 311234880 |
| 12 | 166738a30 |
| 13 | a7933619 |
| 14 | 643cc632 |
| 15 | 3d5506c0 |
| hex | 279ea2c4 |
664707780 has 144 divisors (see below), whose sum is σ = 2315476800. Its totient is φ = 152651520.
The previous prime is 664707779. The next prime is 664707781. The reversal of 664707780 is 87707466.
664707780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (664707779) and next prime (664707781).
It is a Harshad number since it is a multiple of its sum of digits (45).
It is not an unprimeable number, because it can be changed into a prime (664707781) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28786 + ... + 46454.
It is an arithmetic number, because the mean of its divisors is an integer number (16079700).
Almost surely, 2664707780 is an apocalyptic number.
664707780 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 664707780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157738400).
664707780 is an abundant number, since it is smaller than the sum of its proper divisors (1650769020).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
664707780 is a wasteful number, since it uses less digits than its factorization.
664707780 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 17714 (or 17709 counting only the distinct ones).
The product of its (nonzero) digits is 395136, while the sum is 45.
The square root of 664707780 is about 25781.9273911009. The cubic root of 664707780 is about 872.7240027695.
It can be divided in two parts, 66 and 4707780, that added together give a triangular number (4707846 = T3068).
The spelling of 664707780 in words is "six hundred sixty-four million, seven hundred seven thousand, seven hundred eighty".
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