639953424 has 60 divisors (see below), whose sum is σ = 1953802032. Its totient is φ = 193924800.

The previous prime is 639953401. The next prime is 639953467. The reversal of 639953424 is 424359936.

639953424 is a `hidden beast` number, since 6 + 3 + 99 + 534 + 24 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 639953424.

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 11 ways as a sum of consecutive naturals, for example, 200422 + ... + 203589.

Almost surely, 2^639953424 is an apocalyptic number.

It is an amenable number.

639953424 is an abundant number, since it is smaller than the sum of its proper divisors (1313848608).

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

639953424 is a wasteful number, since it uses less digits than its factorization.

639953424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404036 (or 404027 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 639953424 is about 25297.3007255715. The cubic root of 639953424 is about 861.7529703077.

The spelling of 639953424 in words is "six hundred thirty-nine million, nine hundred fifty-three thousand, four hundred twenty-four".