72438863787338 has 16 divisors (see below), whose sum is σ = 108889816669800. Its totient is φ = 36142325841600.

The previous prime is 72438863787239. The next prime is 72438863787341. The reversal of 72438863787338 is 83378736883427.

It can be written as a sum of positive squares in 4 ways, for example, as 62032903953409 + 10405959833929 = 7876097^2 + 3225827^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14758613 + ... + 19044536.

Almost surely, 2^{72438863787338} is an apocalyptic number.

72438863787338 is a deficient number, since it is larger than the sum of its proper divisors (36450952882462).

72438863787338 is a wasteful number, since it uses less digits than its factorization.

72438863787338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33805433.

The product of its digits is 5462360064, while the sum is 77.

The spelling of 72438863787338 in words is "seventy-two trillion, four hundred thirty-eight billion, eight hundred sixty-three million, seven hundred eighty-seven thousand, three hundred thirty-eight".