645569056 has 48 divisors (see below), whose sum is σ = 1388832480. Its totient is φ = 292948480.

The previous prime is 645569021. The next prime is 645569063. The reversal of 645569056 is 650965546.

It is a happy number.

It is a super-2 number, since 2×645569056² = 833518812129462272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 645568997 and 645569015.

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, 283635 + ... + 285901.

It is an arithmetic number, because the mean of its divisors is an integer number (28934010).

Almost surely, 2^645569056 is an apocalyptic number.

It is an amenable number.

645569056 is an abundant number, since it is smaller than the sum of its proper divisors (743263424).

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

645569056 is a wasteful number, since it uses less digits than its factorization.

645569056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097 (or 3089 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 645569056 is about 25408.0510075055. The cubic root of 645569056 is about 864.2662788088.

The spelling of 645569056 in words is "six hundred forty-five million, five hundred sixty-nine thousand, fifty-six".