638760 has 32 divisors (see below), whose sum is σ = 1916640. Its totient is φ = 170304.

The previous prime is 638719. The next prime is 638767. The reversal of 638760 is 67836.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (638767) 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 in 7 ways as a sum of consecutive naturals, for example, 2542 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (59895).

2⁶³⁸⁷⁶⁰ is an apocalyptic number.

638760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638760 is an abundant number, since it is smaller than the sum of its proper divisors (1277880).

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

638760 is a wasteful number, since it uses less digits than its factorization.

638760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337 (or 5333 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 638760 is about 799.2246242453. The cubic root of 638760 is about 86.1216953884.

The spelling of 638760 in words is "six hundred thirty-eight thousand, seven hundred sixty".