639054057 has 32 divisors (see below), whose sum is σ = 923811840. Its totient is φ = 391786560.

The previous prime is 639054023. The next prime is 639054061. The reversal of 639054057 is 750450936.

It is not a de Polignac number, because 639054057 - 2⁷ = 639053929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639054007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 356319 + ... + 358107.

It is an arithmetic number, because the mean of its divisors is an integer number (28869120).

Almost surely, 2^639054057 is an apocalyptic number.

It is an amenable number.

639054057 is a deficient number, since it is larger than the sum of its proper divisors (284757783).

639054057 is a wasteful number, since it uses less digits than its factorization.

639054057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 639054057 is about 25279.5185278518. The cubic root of 639054057 is about 861.3490890743.

The spelling of 639054057 in words is "six hundred thirty-nine million, fifty-four thousand, fifty-seven".