86972681 has 4 divisors (see below), whose sum is σ = 89323332. Its totient is φ = 84622032.

The previous prime is 86972621. The next prime is 86972687. The reversal of 86972681 is 18627968.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62805625 + 24167056 = 7925^2 + 4916^2 .

It is a cyclic number.

It is not a de Polignac number, because 86972681 - 2¹⁰ = 86971657 is a prime.

It is a super-2 number, since 2×86972681² = 15128494480655522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86972687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1175270 + ... + 1175343.

It is an arithmetic number, because the mean of its divisors is an integer number (22330833).

Almost surely, 2^86972681 is an apocalyptic number.

It is an amenable number.

86972681 is a deficient number, since it is larger than the sum of its proper divisors (2350651).

86972681 is a wasteful number, since it uses less digits than its factorization.

86972681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350650.

The product of its digits is 290304, while the sum is 47.

The square root of 86972681 is about 9325.9144859901. The cubic root of 86972681 is about 443.0583773177.

The spelling of 86972681 in words is "eighty-six million, nine hundred seventy-two thousand, six hundred eighty-one".