72722756864 has 36 divisors (see below), whose sum is σ = 147900363156. Its totient is φ = 35675308032.

The previous prime is 72722756837. The next prime is 72722756881. The reversal of 72722756864 is 46865722727.

It can be written as a sum of positive squares in 2 ways, for example, as 55243801600 + 17478955264 = 235040^2 + 132208^2 .

It is a super-2 number, since 2×72722756864² (a number of 23 digits) contains 22 as substring.

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, 2666369 + ... + 2693504.

It is an arithmetic number, because the mean of its divisors is an integer number (4108343421).

Almost surely, 2^72722756864 is an apocalyptic number.

It is an amenable number.

72722756864 is an abundant number, since it is smaller than the sum of its proper divisors (75177606292).

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

72722756864 is an equidigital number, since it uses as much as digits as its factorization.

72722756864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5359942 (or 5359928 counting only the distinct ones).

The product of its digits is 15805440, while the sum is 56.

The spelling of 72722756864 in words is "seventy-two billion, seven hundred twenty-two million, seven hundred fifty-six thousand, eight hundred sixty-four".