638944716 has 24 divisors (see below), whose sum is σ = 1497276144. Its totient is φ = 212066560.

The previous prime is 638944699. The next prime is 638944717. The reversal of 638944716 is 617449836.

It is not an unprimeable number, because it can be changed into a prime (638944717) 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, 111465 + ... + 117056.

It is an arithmetic number, because the mean of its divisors is an integer number (62386506).

Almost surely, 2^638944716 is an apocalyptic number.

It is an amenable number.

638944716 is an abundant number, since it is smaller than the sum of its proper divisors (858331428).

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

638944716 is a wasteful number, since it uses less digits than its factorization.

638944716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228761 (or 228759 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 638944716 is about 25277.3557952567. The cubic root of 638944716 is about 861.2999611788.

The spelling of 638944716 in words is "six hundred thirty-eight million, nine hundred forty-four thousand, seven hundred sixteen".