56638 has 4 divisors (see below), whose sum is σ = 84960. Its totient is φ = 28318.

The previous prime is 56633. The next prime is 56659. The reversal of 56638 is 83665.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56633) 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 as a sum of consecutive naturals, namely, 14158 + ... + 14161.

It is an arithmetic number, because the mean of its divisors is an integer number (21240).

2⁵⁶⁶³⁸ is an apocalyptic number.

56638 is a deficient number, since it is larger than the sum of its proper divisors (28322).

56638 is a wasteful number, since it uses less digits than its factorization.

56638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28321.

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

The square root of 56638 is about 237.9873946242. The cubic root of 56638 is about 38.4033670369.

It can be divided in two parts, 5663 and 8, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 56638 in words is "fifty-six thousand, six hundred thirty-eight".