72420644641024 has 27 divisors (see below), whose sum is σ = 144558667928577. Its totient is φ = 36210254240256.

The previous prime is 72420644641013. The next prime is 72420644641039. The reversal of 72420644641024 is 42014644602427.

The square root of 72420644641024 is 8510032.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2436845881600 + 69983798759424 = 1561040^2 + 8365632^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 135894574 + ... + 136426450.

Almost surely, 2^{72420644641024} is an apocalyptic number.

72420644641024 is the 8510032-nd square number.

It is an amenable number.

72420644641024 is a deficient number, since it is larger than the sum of its proper divisors (72138023287553).

72420644641024 is an frugal number, since it uses more digits than its factorization.

72420644641024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063770 (or 531879 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 46.

The spelling of 72420644641024 in words is "seventy-two trillion, four hundred twenty billion, six hundred forty-four million, six hundred forty-one thousand, twenty-four".