2604640656 has 40 divisors (see below), whose sum is σ = 6730997760. Its totient is φ = 867911296.

The previous prime is 2604640613. The next prime is 2604640667. The reversal of 2604640656 is 6560464062.

It is a super-2 number, since 2×2604640656² = 13568305893776220672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161905 + ... + 177263.

It is an arithmetic number, because the mean of its divisors is an integer number (168274944).

Almost surely, 2^2604640656 is an apocalyptic number.

It is an amenable number.

2604640656 is an abundant number, since it is smaller than the sum of its proper divisors (4126357104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2604640656 is a wasteful number, since it uses less digits than its factorization.

2604640656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18903 (or 18897 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 2604640656 is about 51035.6802247212. The cubic root of 2604640656 is about 1375.8864861515.

The spelling of 2604640656 in words is "two billion, six hundred four million, six hundred forty thousand, six hundred fifty-six".