85731579 has 12 divisors (see below), whose sum is σ = 123945432. Its totient is φ = 57103200.

The previous prime is 85731563. The next prime is 85731589. The reversal of 85731579 is 97513758.

85731579 is a `hidden beast` number, since 8 + 5 + 73 + 1 + 579 = 666.

It is not a de Polignac number, because 85731579 - 2⁴ = 85731563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85731539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8284 + ... + 15494.

It is an arithmetic number, because the mean of its divisors is an integer number (10328786).

Almost surely, 2^85731579 is an apocalyptic number.

85731579 is a deficient number, since it is larger than the sum of its proper divisors (38213853).

85731579 is a wasteful number, since it uses less digits than its factorization.

85731579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538 (or 8535 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 85731579 is about 9259.1348947944. The cubic root of 85731579 is about 440.9407883233.

The spelling of 85731579 in words is "eighty-five million, seven hundred thirty-one thousand, five hundred seventy-nine".