645415656 has 32 divisors (see below), whose sum is σ = 1647872640. Its totient is φ = 210560768.

The previous prime is 645415649. The next prime is 645415709. The reversal of 645415656 is 656514546.

It is a super-2 number, since 2×645415656² = 833122738019820672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284961 + ... + 287216.

It is an arithmetic number, because the mean of its divisors is an integer number (51496020).

Almost surely, 2^645415656 is an apocalyptic number.

It is an amenable number.

645415656 is an abundant number, since it is smaller than the sum of its proper divisors (1002456984).

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

645415656 is a wasteful number, since it uses less digits than its factorization.

645415656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572233 (or 572229 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

The square root of 645415656 is about 25405.0320999600. The cubic root of 645415656 is about 864.1978177880.

The spelling of 645415656 in words is "six hundred forty-five million, four hundred fifteen thousand, six hundred fifty-six".