86681958724 has 9 divisors (see below), whose sum is σ = 151694458237. Its totient is φ = 43340684944.

The previous prime is 86681958703. The next prime is 86681958739. The reversal of 86681958724 is 42785918668.

It is a happy number.

The square root of 86681958724 is 294418.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 80192045124 + 6489913600 = 283182^2 + 80560^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 515232 + ... + 662440.

Almost surely, 2^86681958724 is an apocalyptic number.

86681958724 is the 294418-th square number.

It is an amenable number.

86681958724 is a deficient number, since it is larger than the sum of its proper divisors (65012499513).

86681958724 is an frugal number, since it uses more digits than its factorization.

86681958724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294422 (or 147211 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 64.

Multiplying 86681958724 by its sum of digits (64), we get a square (5547645358336 = 2355344²).

The spelling of 86681958724 in words is "eighty-six billion, six hundred eighty-one million, nine hundred fifty-eight thousand, seven hundred twenty-four".