64315820 has 36 divisors (see below), whose sum is σ = 141214080. Its totient is φ = 24603744.

The previous prime is 64315819. The next prime is 64315859. The reversal of 64315820 is 2851346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7541 + ... + 13619.

Almost surely, 2^64315820 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 64315820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70607040).

64315820 is an abundant number, since it is smaller than the sum of its proper divisors (76898260).

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

64315820 is a wasteful number, since it uses less digits than its factorization.

64315820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6134 (or 6109 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 64315820 is about 8019.7144587572. The cubic root of 64315820 is about 400.6568790177.

The spelling of 64315820 in words is "sixty-four million, three hundred fifteen thousand, eight hundred twenty".