72912894338 has 4 divisors (see below), whose sum is σ = 109369341510. Its totient is φ = 36456447168.

The previous prime is 72912894317. The next prime is 72912894347. The reversal of 72912894338 is 83349821927.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 71951088169 + 961806169 = 268237^2 + 31013^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18228223583 + ... + 18228223586.

Almost surely, 2^72912894338 is an apocalyptic number.

72912894338 is a deficient number, since it is larger than the sum of its proper divisors (36456447172).

72912894338 is a wasteful number, since it uses less digits than its factorization.

72912894338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36456447171.

The product of its digits is 5225472, while the sum is 56.

The spelling of 72912894338 in words is "seventy-two billion, nine hundred twelve million, eight hundred ninety-four thousand, three hundred thirty-eight".