64722889520 has 20 divisors (see below), whose sum is σ = 150480718320. Its totient is φ = 25889155776.

The previous prime is 64722889499. The next prime is 64722889537. The reversal of 64722889520 is 2598822746.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404517980 + ... + 404518139.

It is an arithmetic number, because the mean of its divisors is an integer number (7524035916).

Almost surely, 2^64722889520 is an apocalyptic number.

It is an amenable number.

64722889520 is an abundant number, since it is smaller than the sum of its proper divisors (85757828800).

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

64722889520 is a wasteful number, since it uses less digits than its factorization.

64722889520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809036132 (or 809036126 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 64722889520 in words is "sixty-four billion, seven hundred twenty-two million, eight hundred eighty-nine thousand, five hundred twenty".