645213372 has 24 divisors (see below), whose sum is σ = 1505908992. Its totient is φ = 215012400.

The previous prime is 645213367. The next prime is 645213391. The reversal of 645213372 is 273312546.

It is a super-2 number, since 2×645213372² = 832600590815220768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80047 + ... + 87737.

It is an arithmetic number, because the mean of its divisors is an integer number (62746208).

Almost surely, 2^645213372 is an apocalyptic number.

It is an amenable number.

645213372 is an abundant number, since it is smaller than the sum of its proper divisors (860695620).

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

645213372 is a wasteful number, since it uses less digits than its factorization.

645213372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14689 (or 14687 counting only the distinct ones).

The product of its digits is 30240, while the sum is 33.

The square root of 645213372 is about 25401.0506081934. The cubic root of 645213372 is about 864.1075236982.

The spelling of 645213372 in words is "six hundred forty-five million, two hundred thirteen thousand, three hundred seventy-two".