638848836 has 48 divisors (see below), whose sum is σ = 1672702080. Its totient is φ = 210837600.

The previous prime is 638848823. The next prime is 638848877.

It is a happy number.

638848836 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18376 + ... + 40191.

It is an arithmetic number, because the mean of its divisors is an integer number (34847960).

Almost surely, 2^638848836 is an apocalyptic number.

It is an amenable number.

638848836 is an abundant number, since it is smaller than the sum of its proper divisors (1033853244).

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

638848836 is a wasteful number, since it uses less digits than its factorization.

638848836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58681 (or 58673 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 54.

The square root of 638848836 is about 25275.4591649687. The cubic root of 638848836 is about 861.2568768194.

The spelling of 638848836 in words is "six hundred thirty-eight million, eight hundred forty-eight thousand, eight hundred thirty-six".