638675 has 12 divisors (see below), whose sum is σ = 807240. Its totient is φ = 501120.

The previous prime is 638669. The next prime is 638689. The reversal of 638675 is 576836.

It is a happy number.

It is not a de Polignac number, because 638675 - 2¹⁸ = 376531 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1259 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (67270).

2⁶³⁸⁶⁷⁵ is an apocalyptic number.

638675 is a deficient number, since it is larger than the sum of its proper divisors (168565).

638675 is a wasteful number, since it uses less digits than its factorization.

638675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 497 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 638675 is about 799.1714459364. The cubic root of 638675 is about 86.1178751383.

The spelling of 638675 in words is "six hundred thirty-eight thousand, six hundred seventy-five".