638488 has 8 divisors (see below), whose sum is σ = 1197180. Its totient is φ = 319240.

The previous prime is 638467. The next prime is 638489. The reversal of 638488 is 884836.

638488 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×638488² = 815333852288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39898 + ... + 39913.

2⁶³⁸⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

638488 is a deficient number, since it is larger than the sum of its proper divisors (558692).

638488 is a wasteful number, since it uses less digits than its factorization.

638488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79817 (or 79813 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 638488 is about 799.0544411991. The cubic root of 638488 is about 86.1094693948.

The spelling of 638488 in words is "six hundred thirty-eight thousand, four hundred eighty-eight".