645008536 has 8 divisors (see below), whose sum is σ = 1209391020. Its totient is φ = 322504264.

The previous prime is 645008513. The next prime is 645008549. The reversal of 645008536 is 635800546.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 645008495 and 645008504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40313026 + ... + 40313041.

Almost surely, 2^645008536 is an apocalyptic number.

It is an amenable number.

645008536 is a deficient number, since it is larger than the sum of its proper divisors (564382484).

645008536 is a wasteful number, since it uses less digits than its factorization.

645008536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80626073 (or 80626069 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 645008536 is about 25397.0182501805. The cubic root of 645008536 is about 864.0160712317.

The spelling of 645008536 in words is "six hundred forty-five million, eight thousand, five hundred thirty-six".