72768438986 has 4 divisors (see below), whose sum is σ = 109152658482. Its totient is φ = 36384219492.

The previous prime is 72768438959. The next prime is 72768438991. The reversal of 72768438986 is 68983486727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68983486727 = 2383 ⋅28948169.

It can be written as a sum of positive squares in only one way, i.e., 71580327025 + 1188111961 = 267545^2 + 34469^2 .

It is a super-3 number, since 3×72768438986³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18192109745 + ... + 18192109748.

Almost surely, 2^72768438986 is an apocalyptic number.

72768438986 is a deficient number, since it is larger than the sum of its proper divisors (36384219496).

72768438986 is a wasteful number, since it uses less digits than its factorization.

72768438986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36384219495.

The product of its digits is 195084288, while the sum is 68.

The spelling of 72768438986 in words is "seventy-two billion, seven hundred sixty-eight million, four hundred thirty-eight thousand, nine hundred eighty-six".