725678644 has 12 divisors (see below), whose sum is σ = 1272263104. Its totient is φ = 362174904.

The previous prime is 725678623. The next prime is 725678689. The reversal of 725678644 is 446876527.

It is a congruent number.

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, 163644 + ... + 168019.

Almost surely, 2^725678644 is an apocalyptic number.

It is an amenable number.

725678644 is a deficient number, since it is larger than the sum of its proper divisors (546584460).

725678644 is a wasteful number, since it uses less digits than its factorization.

725678644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332214 (or 332212 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 49.

The square root of 725678644 is about 26938.4231906769. The cubic root of 725678644 is about 898.6311058077.

The spelling of 725678644 in words is "seven hundred twenty-five million, six hundred seventy-eight thousand, six hundred forty-four".