64722308720 has 20 divisors (see below), whose sum is σ = 150479367960. Its totient is φ = 25888923456.

The previous prime is 64722308699. The next prime is 64722308731. The reversal of 64722308720 is 2780322746.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404514350 + ... + 404514509.

It is an arithmetic number, because the mean of its divisors is an integer number (7523968398).

Almost surely, 2^64722308720 is an apocalyptic number.

It is an amenable number.

64722308720 is an abundant number, since it is smaller than the sum of its proper divisors (85757059240).

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

64722308720 is a wasteful number, since it uses less digits than its factorization.

64722308720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809028872 (or 809028866 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 64722308720 in words is "sixty-four billion, seven hundred twenty-two million, three hundred eight thousand, seven hundred twenty".