639361044 has 36 divisors (see below), whose sum is σ = 1847043744. Its totient is φ = 182674512.

The previous prime is 639361043. The next prime is 639361049. The reversal of 639361044 is 440163936.

639361044 is a `hidden beast` number, since 6 + 39 + 3 + 610 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639361043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1268322 + ... + 1268825.

Almost surely, 2^639361044 is an apocalyptic number.

It is an amenable number.

639361044 is an abundant number, since it is smaller than the sum of its proper divisors (1207682700).

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

639361044 is a wasteful number, since it uses less digits than its factorization.

639361044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537164 (or 2537159 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 639361044 is about 25285.5896510246. The cubic root of 639361044 is about 861.4869911501.

It can be divided in two parts, 63936 and 1044, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 639361044 in words is "six hundred thirty-nine million, three hundred sixty-one thousand, forty-four".