645260756 has 24 divisors (see below), whose sum is σ = 1295298816. Its totient is φ = 275516640.

The previous prime is 645260713. The next prime is 645260771. The reversal of 645260756 is 657062546.

It is a super-2 number, since 2×645260756² = 832722886467383072, which contains 22 as substring.

It is a congruent number.

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, 34931 + ... + 50106.

It is an arithmetic number, because the mean of its divisors is an integer number (53970784).

Almost surely, 2^645260756 is an apocalyptic number.

It is an amenable number.

645260756 is an abundant number, since it is smaller than the sum of its proper divisors (650038060).

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

645260756 is a wasteful number, since it uses less digits than its factorization.

645260756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85319 (or 85317 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 645260756 is about 25401.9833083954. The cubic root of 645260756 is about 864.1286763227.

The spelling of 645260756 in words is "six hundred forty-five million, two hundred sixty thousand, seven hundred fifty-six".