64531116 has 72 divisors (see below), whose sum is σ = 186024384. Its totient is φ = 18685440.

The previous prime is 64531109. The next prime is 64531151. The reversal of 64531116 is 61113546.

64531116 is a `hidden beast` number, since 645 + 3 + 1 + 1 + 16 = 666.

It is a super-4 number, since 4×64531116⁴ (a number of 32 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64531116.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3901 + ... + 12011.

It is an arithmetic number, because the mean of its divisors is an integer number (2583672).

Almost surely, 2^64531116 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 64531116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93012192).

64531116 is an abundant number, since it is smaller than the sum of its proper divisors (121493268).

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

64531116 is a wasteful number, since it uses less digits than its factorization.

64531116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151 (or 8146 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 64531116 is about 8033.1261660701. The cubic root of 64531116 is about 401.1034448910.

It can be divided in two parts, 6453 and 1116, that added together give a square (7569 = 87²).

The spelling of 64531116 in words is "sixty-four million, five hundred thirty-one thousand, one hundred sixteen".