639056 has 20 divisors (see below), whose sum is σ = 1351104. Its totient is φ = 290400.

The previous prime is 639053. The next prime is 639083. The reversal of 639056 is 650936.

It is a super-2 number, since 2×639056² = 816785142272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640 + ... + 1991.

2⁶³⁹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

639056 is an abundant number, since it is smaller than the sum of its proper divisors (712048).

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

639056 is a wasteful number, since it uses less digits than its factorization.

639056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650 (or 3644 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 639056 is about 799.4097822769. The cubic root of 639056 is about 86.1349962031.

It can be divided in two parts, 6390 and 56, that added together give a palindrome (6446).

The spelling of 639056 in words is "six hundred thirty-nine thousand, fifty-six".