639900324 has 60 divisors (see below), whose sum is σ = 1911807744. Its totient is φ = 182828016.

The previous prime is 639900307. The next prime is 639900337. The reversal of 639900324 is 423009936.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 138804 + ... + 143339.

Almost surely, 2^639900324 is an apocalyptic number.

It is an amenable number.

639900324 is an abundant number, since it is smaller than the sum of its proper divisors (1271907420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639900324 is a wasteful number, since it uses less digits than its factorization.

639900324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282166 (or 282155 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 639900324 is about 25296.2511847111. The cubic root of 639900324 is about 861.7291350583.

The spelling of 639900324 in words is "six hundred thirty-nine million, nine hundred thousand, three hundred twenty-four".