638965068 has 48 divisors (see below), whose sum is σ = 1727921664. Its totient is φ = 179988480.

The previous prime is 638965049. The next prime is 638965121. The reversal of 638965068 is 860569836.

It is a self number, because there is not a number n which added to its sum of digits gives 638965068.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47605 + ... + 59532.

It is an arithmetic number, because the mean of its divisors is an integer number (35998368).

Almost surely, 2^638965068 is an apocalyptic number.

It is an amenable number.

638965068 is an abundant number, since it is smaller than the sum of its proper divisors (1088956596).

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

638965068 is a wasteful number, since it uses less digits than its factorization.

638965068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107222 (or 107220 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 638965068 is about 25277.7583658045. The cubic root of 638965068 is about 861.3091059401.

The spelling of 638965068 in words is "six hundred thirty-eight million, nine hundred sixty-five thousand, sixty-eight".