639692952 has 64 divisors (see below), whose sum is σ = 1642999680. Its totient is φ = 207474432.

The previous prime is 639692939. The next prime is 639692953. The reversal of 639692952 is 259296936.

It is a junction number, because it is equal to n+sod(n) for n = 639692895 and 639692904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639692953) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 131068 + ... + 135860.

It is an arithmetic number, because the mean of its divisors is an integer number (25671870).

Almost surely, 2^639692952 is an apocalyptic number.

It is an amenable number.

639692952 is an abundant number, since it is smaller than the sum of its proper divisors (1003306728).

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

639692952 is a wasteful number, since it uses less digits than its factorization.

639692952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952 (or 4948 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 51.

The square root of 639692952 is about 25292.1519843607. The cubic root of 639692952 is about 861.6360383709.

The spelling of 639692952 in words is "six hundred thirty-nine million, six hundred ninety-two thousand, nine hundred fifty-two".