647631168 has 112 divisors (see below), whose sum is σ = 1803050496. Its totient is φ = 204871680.

The previous prime is 647631157. The next prime is 647631223. The reversal of 647631168 is 861136746.

It is a super-2 number, since 2×647631168² = 838852259530088448, which contains 22 as substring.

It is a congruent number.

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, 314430 + ... + 316482.

Almost surely, 2^647631168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647631168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901525248).

647631168 is an abundant number, since it is smaller than the sum of its proper divisors (1155419328).

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

647631168 is a wasteful number, since it uses less digits than its factorization.

647631168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152 (or 2142 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 647631168 is about 25448.5985468748. The cubic root of 647631168 is about 865.1855296070.

The spelling of 647631168 in words is "six hundred forty-seven million, six hundred thirty-one thousand, one hundred sixty-eight".