645635056 has 20 divisors (see below), whose sum is σ = 1364638104. Its totient is φ = 293470400.

The previous prime is 645635017. The next prime is 645635057. The reversal of 645635056 is 650536546.

It is a happy number.

It is a super-2 number, since 2×645635056² = 833689251072246272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645635057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834015 + ... + 1834366.

Almost surely, 2^645635056 is an apocalyptic number.

It is an amenable number.

645635056 is an abundant number, since it is smaller than the sum of its proper divisors (719003048).

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

645635056 is a wasteful number, since it uses less digits than its factorization.

645635056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668400 (or 3668394 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 645635056 is about 25409.3497752304. The cubic root of 645635056 is about 864.2957306699.

The spelling of 645635056 in words is "six hundred forty-five million, six hundred thirty-five thousand, fifty-six".