72738903794 has 4 divisors (see below), whose sum is σ = 109108355694. Its totient is φ = 36369451896.

The previous prime is 72738903779. The next prime is 72738903817. The reversal of 72738903794 is 49730983727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49730983727 = 479 ⋅103822513.

It can be written as a sum of positive squares in only one way, i.e., 55466373169 + 17272530625 = 235513^2 + 131425^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18184725947 + ... + 18184725950.

Almost surely, 2^72738903794 is an apocalyptic number.

72738903794 is a deficient number, since it is larger than the sum of its proper divisors (36369451900).

72738903794 is a wasteful number, since it uses less digits than its factorization.

72738903794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36369451899.

The product of its (nonzero) digits is 16003008, while the sum is 59.

The spelling of 72738903794 in words is "seventy-two billion, seven hundred thirty-eight million, nine hundred three thousand, seven hundred ninety-four".