72786681 has 40 divisors (see below), whose sum is σ = 119621568. Its totient is φ = 43740000.

The previous prime is 72786677. The next prime is 72786683. The reversal of 72786681 is 18668727.

It is not a de Polignac number, because 72786681 - 2² = 72786677 is a prime.

It is a super-2 number, since 2×72786681² = 10595801861991522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72786683) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 134271 + ... + 134811.

Almost surely, 2^72786681 is an apocalyptic number.

It is an amenable number.

72786681 is a deficient number, since it is larger than the sum of its proper divisors (46834887).

72786681 is a wasteful number, since it uses less digits than its factorization.

72786681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715 (or 706 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 72786681 is about 8531.5110619397. The cubic root of 72786681 is about 417.5264300143.

The spelling of 72786681 in words is "seventy-two million, seven hundred eighty-six thousand, six hundred eighty-one".