64131616 has 24 divisors (see below), whose sum is σ = 133687260. Its totient is φ = 30179328.

The previous prime is 64131607. The next prime is 64131629. The reversal of 64131616 is 61613146.

It can be written as a sum of positive squares in 2 ways, for example, as 64064016 + 67600 = 8004^2 + 260^2 .

It is a super-2 number, since 2×64131616² = 8225728341542912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58401 + ... + 59488.

Almost surely, 2^64131616 is an apocalyptic number.

It is an amenable number.

64131616 is an abundant number, since it is smaller than the sum of its proper divisors (69555644).

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

64131616 is a wasteful number, since it uses less digits than its factorization.

64131616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117916 (or 117908 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 64131616 is about 8008.2217751508. The cubic root of 64131616 is about 400.2740122504.

The spelling of 64131616 in words is "sixty-four million, one hundred thirty-one thousand, six hundred sixteen".