638331057 has 32 divisors (see below), whose sum is σ = 1163912960. Its totient is φ = 336700800.

The previous prime is 638331047. The next prime is 638331059. The reversal of 638331057 is 750133836.

638331057 is a `hidden beast` number, since 638 + 3 + 3 + 10 + 5 + 7 = 666.

It is not a de Polignac number, because 638331057 - 2⁷ = 638330929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638331059) 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 31 ways as a sum of consecutive naturals, for example, 127444 + ... + 132357.

It is an arithmetic number, because the mean of its divisors is an integer number (36372280).

Almost surely, 2^638331057 is an apocalyptic number.

It is an amenable number.

638331057 is a deficient number, since it is larger than the sum of its proper divisors (525581903).

638331057 is a wasteful number, since it uses less digits than its factorization.

638331057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259830 (or 259824 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 638331057 is about 25265.2143667929. The cubic root of 638331057 is about 861.0241346171.

The spelling of 638331057 in words is "six hundred thirty-eight million, three hundred thirty-one thousand, fifty-seven".