638056 has 8 divisors (see below), whose sum is σ = 1196370. Its totient is φ = 319024.

The previous prime is 638051. The next prime is 638059. The reversal of 638056 is 650836.

638056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 133956 = 710^2 + 366^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (638051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39871 + ... + 39886.

2⁶³⁸⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

638056 is a deficient number, since it is larger than the sum of its proper divisors (558314).

638056 is a wasteful number, since it uses less digits than its factorization.

638056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79763 (or 79759 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 638056 is about 798.7840759554. The cubic root of 638056 is about 86.0900445017.

It can be divided in two parts, 63 and 8056, that multiplied together give a triangular number (507528 = T₁₀₀₇).

The spelling of 638056 in words is "six hundred thirty-eight thousand, fifty-six".