64615604820 has 48 divisors (see below), whose sum is σ = 194840903040. Its totient is φ = 15905379456.

The previous prime is 64615604803. The next prime is 64615604831. The reversal of 64615604820 is 2840651646.

64615604820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41419480 + ... + 41421039.

It is an arithmetic number, because the mean of its divisors is an integer number (4059185480).

Almost surely, 2^64615604820 is an apocalyptic number.

64615604820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64615604820 is an abundant number, since it is smaller than the sum of its proper divisors (130225298220).

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

64615604820 is a wasteful number, since it uses less digits than its factorization.

64615604820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82840544 (or 82840542 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 64615604820 in words is "sixty-four billion, six hundred fifteen million, six hundred four thousand, eight hundred twenty".