64623531564 has 96 divisors (see below), whose sum is σ = 168666624000. Its totient is φ = 21396927168.

The previous prime is 64623531563. The next prime is 64623531569. The reversal of 64623531564 is 46513532646.

64623531564 is a `hidden beast` number, since 6 + 4 + 62 + 3 + 531 + 56 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (64623531563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28861557 + ... + 28863795.

It is an arithmetic number, because the mean of its divisors is an integer number (1756944000).

Almost surely, 2^64623531564 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 64623531564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84333312000).

64623531564 is an abundant number, since it is smaller than the sum of its proper divisors (104043092436).

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

64623531564 is a wasteful number, since it uses less digits than its factorization.

64623531564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3924 (or 3916 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The spelling of 64623531564 in words is "sixty-four billion, six hundred twenty-three million, five hundred thirty-one thousand, five hundred sixty-four".