638674 has 8 divisors (see below), whose sum is σ = 963468. Its totient is φ = 317520.

The previous prime is 638669. The next prime is 638689. The reversal of 638674 is 476836.

It can be written as a sum of positive squares in 2 ways, for example, as 511225 + 127449 = 715^2 + 357^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 417 + ... + 1204.

2⁶³⁸⁶⁷⁴ is an apocalyptic number.

638674 is a deficient number, since it is larger than the sum of its proper divisors (324794).

638674 is a wasteful number, since it uses less digits than its factorization.

638674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820.

The product of its digits is 24192, while the sum is 34.

The square root of 638674 is about 799.1708202881. The cubic root of 638674 is about 86.1178301922.

The spelling of 638674 in words is "six hundred thirty-eight thousand, six hundred seventy-four".