639525412 has 48 divisors (see below), whose sum is σ = 1189146112. Its totient is φ = 300464640.

The previous prime is 639525377. The next prime is 639525413. The reversal of 639525412 is 214525936.

It is not an unprimeable number, because it can be changed into a prime (639525413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1476748 + ... + 1477180.

Almost surely, 2^639525412 is an apocalyptic number.

639525412 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

639525412 is a deficient number, since it is larger than the sum of its proper divisors (549620700).

639525412 is a wasteful number, since it uses less digits than its factorization.

639525412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 786 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 639525412 is about 25288.8396728676. The cubic root of 639525412 is about 861.5608089940.

The spelling of 639525412 in words is "six hundred thirty-nine million, five hundred twenty-five thousand, four hundred twelve".