64316520 has 96 divisors (see below), whose sum is σ = 220053600. Its totient is φ = 16246656.

The previous prime is 64316513. The next prime is 64316531. The reversal of 64316520 is 2561346.

64316520 is a `hidden beast` number, since 6 + 4 + 3 + 1 + 652 + 0 = 666.

64316520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64316520² = 8273229489820800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2139 + ... + 11541.

It is an arithmetic number, because the mean of its divisors is an integer number (2292225).

Almost surely, 2^64316520 is an apocalyptic number.

64316520 is a gapful number since it is divisible by the number (60) 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 64316520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110026800).

64316520 is an abundant number, since it is smaller than the sum of its proper divisors (155737080).

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

64316520 is a wasteful number, since it uses less digits than its factorization.

64316520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9439 (or 9432 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 64316520 is about 8019.7581010901. The cubic root of 64316520 is about 400.6583325678.

Adding to 64316520 its reverse (2561346), we get a palindrome (66877866).

The spelling of 64316520 in words is "sixty-four million, three hundred sixteen thousand, five hundred twenty".