638896016 has 40 divisors (see below), whose sum is σ = 1353633600. Its totient is φ = 289710720.

The previous prime is 638896007. The next prime is 638896099. The reversal of 638896016 is 610698836.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73130 + ... + 81398.

It is an arithmetic number, because the mean of its divisors is an integer number (33840840).

Almost surely, 2^638896016 is an apocalyptic number.

It is an amenable number.

638896016 is an abundant number, since it is smaller than the sum of its proper divisors (714737584).

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

638896016 is a wasteful number, since it uses less digits than its factorization.

638896016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8727 (or 8721 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 638896016 is about 25276.3924641156. The cubic root of 638896016 is about 861.2780780264.

The spelling of 638896016 in words is "six hundred thirty-eight million, eight hundred ninety-six thousand, sixteen".