639052544 has 54 divisors (see below), whose sum is σ = 1381374036. Its totient is φ = 294927360.

The previous prime is 639052489. The next prime is 639052577. The reversal of 639052544 is 445250936.

It is a junction number, because it is equal to n+sod(n) for n = 639052498 and 639052507.

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 5 ways as a sum of consecutive naturals, for example, 35879 + ... + 50649.

Almost surely, 2^639052544 is an apocalyptic number.

639052544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639052544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690687018).

639052544 is an abundant number, since it is smaller than the sum of its proper divisors (742321492).

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

639052544 is a wasteful number, since it uses less digits than its factorization.

639052544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14813 (or 14786 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 639052544 is about 25279.4886024223. The cubic root of 639052544 is about 861.3484093080.

The spelling of 639052544 in words is "six hundred thirty-nine million, fifty-two thousand, five hundred forty-four".