638083964 has 12 divisors (see below), whose sum is σ = 1276167984. Its totient is φ = 273464544.

The previous prime is 638083961. The next prime is 638084003. The reversal of 638083964 is 469380836.

638083964 is an admirable number.

It is a super-2 number, since 2×638083964² = 814302290227906592, which contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638083961) 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 3 ways as a sum of consecutive naturals, for example, 11394329 + ... + 11394384.

It is an arithmetic number, because the mean of its divisors is an integer number (106347332).

Almost surely, 2^638083964 is an apocalyptic number.

It is an amenable number.

638083964 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638083964 is a wasteful number, since it uses less digits than its factorization.

638083964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22788724 (or 22788722 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 638083964 is about 25260.3239092455. The cubic root of 638083964 is about 860.9130216913.

The spelling of 638083964 in words is "six hundred thirty-eight million, eighty-three thousand, nine hundred sixty-four".