85686724 has 6 divisors (see below), whose sum is σ = 149951774. Its totient is φ = 42843360.

The previous prime is 85686719. The next prime is 85686737. The reversal of 85686724 is 42768658.

It can be written as a sum of positive squares in only one way, i.e., 51581124 + 34105600 = 7182^2 + 5840^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710837 + ... + 10710844.

Almost surely, 2^85686724 is an apocalyptic number.

It is an amenable number.

85686724 is a deficient number, since it is larger than the sum of its proper divisors (64265050).

85686724 is a wasteful number, since it uses less digits than its factorization.

85686724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21421685 (or 21421683 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 85686724 is about 9256.7123753523. The cubic root of 85686724 is about 440.8638744266.

The spelling of 85686724 in words is "eighty-five million, six hundred eighty-six thousand, seven hundred twenty-four".