637025664 has 256 divisors, whose sum is σ = 1974067200. Its totient is φ = 180111360.

The previous prime is 637025593. The next prime is 637025689. The reversal of 637025664 is 466520736.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7674967 + ... + 7675049.

It is an arithmetic number, because the mean of its divisors is an integer number (7711200).

Almost surely, 2^637025664 is an apocalyptic number.

637025664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 637025664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987033600).

637025664 is an abundant number, since it is smaller than the sum of its proper divisors (1337041536).

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

637025664 is a wasteful number, since it uses less digits than its factorization.

637025664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 637025664 is about 25239.3673454784. The cubic root of 637025664 is about 860.4367999223.

The spelling of 637025664 in words is "six hundred thirty-seven million, twenty-five thousand, six hundred sixty-four".