813125644 has 12 divisors (see below), whose sum is σ = 1423210264. Its totient is φ = 406494144.

The previous prime is 813125639. The next prime is 813125659. The reversal of 813125644 is 446521318.

It is a super-2 number, since 2×813125644² = 1322346625860829472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17044 + ... + 43780.

Almost surely, 2^813125644 is an apocalyptic number.

It is an amenable number.

813125644 is a deficient number, since it is larger than the sum of its proper divisors (610084620).

813125644 is a wasteful number, since it uses less digits than its factorization.

813125644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34344 (or 34342 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 813125644 is about 28515.3580373805. The cubic root of 813125644 is about 933.3672378273.

The spelling of 813125644 in words is "eight hundred thirteen million, one hundred twenty-five thousand, six hundred forty-four".