72866904938 has 4 divisors (see below), whose sum is σ = 109300357410. Its totient is φ = 36433452468.

The previous prime is 72866904917. The next prime is 72866904947. The reversal of 72866904938 is 83940966827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83940966827 = 17 ⋅4937703931.

It can be written as a sum of positive squares in only one way, i.e., 69990406249 + 2876498689 = 264557^2 + 53633^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18216726233 + ... + 18216726236.

Almost surely, 2^72866904938 is an apocalyptic number.

72866904938 is a deficient number, since it is larger than the sum of its proper divisors (36433452472).

72866904938 is a wasteful number, since it uses less digits than its factorization.

72866904938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36433452471.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 72866904938 in words is "seventy-two billion, eight hundred sixty-six million, nine hundred four thousand, nine hundred thirty-eight".