639486632 has 16 divisors (see below), whose sum is σ = 1203370260. Its totient is φ = 318587904.

The previous prime is 639486623. The next prime is 639486689. The reversal of 639486632 is 236684936.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 594676996 + 44809636 = 24386^2 + 6694^2 .

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, 142073 + ... + 146504.

Almost surely, 2^639486632 is an apocalyptic number.

It is an amenable number.

639486632 is a deficient number, since it is larger than the sum of its proper divisors (563883628).

639486632 is a wasteful number, since it uses less digits than its factorization.

639486632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288860 (or 288856 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 47.

The square root of 639486632 is about 25288.0729198569. The cubic root of 639486632 is about 861.5433939949.

The spelling of 639486632 in words is "six hundred thirty-nine million, four hundred eighty-six thousand, six hundred thirty-two".