638364 has 12 divisors (see below), whose sum is σ = 1489544. Its totient is φ = 212784.

The previous prime is 638359. The next prime is 638371. The reversal of 638364 is 463836.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638364.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26587 + ... + 26610.

2⁶³⁸³⁶⁴ is an apocalyptic number.

It is an amenable number.

638364 is an abundant number, since it is smaller than the sum of its proper divisors (851180).

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

638364 is a wasteful number, since it uses less digits than its factorization.

638364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53204 (or 53202 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 638364 is about 798.9768457221. The cubic root of 638364 is about 86.1038946278.

It can be divided in two parts, 638 and 364, that multiplied together give a palindrome (232232).

The spelling of 638364 in words is "six hundred thirty-eight thousand, three hundred sixty-four".