625138988 has 48 divisors (see below), whose sum is σ = 1229733120. Its totient is φ = 276623424.

The previous prime is 625138967. The next prime is 625138991. The reversal of 625138988 is 889831526.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71006 + ... + 79322.

It is an arithmetic number, because the mean of its divisors is an integer number (25619440).

Almost surely, 2^625138988 is an apocalyptic number.

It is an amenable number.

625138988 is a deficient number, since it is larger than the sum of its proper divisors (604594132).

625138988 is a wasteful number, since it uses less digits than its factorization.

625138988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8406 (or 8404 counting only the distinct ones).

The product of its digits is 829440, while the sum is 50.

The square root of 625138988 is about 25002.7796054759. The cubic root of 625138988 is about 855.0513462774.

The spelling of 625138988 in words is "six hundred twenty-five million, one hundred thirty-eight thousand, nine hundred eighty-eight".