639251232 has 48 divisors (see below), whose sum is σ = 1709709120. Its totient is φ = 209061632.

The previous prime is 639251227. The next prime is 639251233. The reversal of 639251232 is 232152936.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×639251232² = 817284275227035648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 639251193 and 639251202.

It is not an unprimeable number, because it can be changed into a prime (639251233) 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 7 ways as a sum of consecutive naturals, for example, 57732 + ... + 67907.

It is an arithmetic number, because the mean of its divisors is an integer number (35618940).

Almost surely, 2^639251232 is an apocalyptic number.

It is an amenable number.

639251232 is an abundant number, since it is smaller than the sum of its proper divisors (1070457888).

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

639251232 is a wasteful number, since it uses less digits than its factorization.

639251232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125705 (or 125697 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 639251232 is about 25283.4181233472. The cubic root of 639251232 is about 861.4376674141.

The spelling of 639251232 in words is "six hundred thirty-nine million, two hundred fifty-one thousand, two hundred thirty-two".