638682 has 16 divisors (see below), whose sum is σ = 1393632. Its totient is φ = 193520.

The previous prime is 638669. The next prime is 638689. The reversal of 638682 is 286836.

638682 is nontrivially palindromic in base 8.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (638689) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4773 + ... + 4904.

It is an arithmetic number, because the mean of its divisors is an integer number (87102).

2⁶³⁸⁶⁸² is an apocalyptic number.

638682 is an abundant number, since it is smaller than the sum of its proper divisors (754950).

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

638682 is a wasteful number, since it uses less digits than its factorization.

638682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9693.

The product of its digits is 13824, while the sum is 33.

The square root of 638682 is about 799.1758254602. The cubic root of 638682 is about 86.1181897599.

The spelling of 638682 in words is "six hundred thirty-eight thousand, six hundred eighty-two".