85717579 has 4 divisors (see below), whose sum is σ = 85840560. Its totient is φ = 85594600.

The previous prime is 85717561. The next prime is 85717603. The reversal of 85717579 is 97571758.

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

It is a cyclic number.

It is not a de Polignac number, because 85717579 - 2¹³ = 85709387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85717279) 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, 60439 + ... + 61840.

It is an arithmetic number, because the mean of its divisors is an integer number (21460140).

Almost surely, 2^85717579 is an apocalyptic number.

85717579 is a deficient number, since it is larger than the sum of its proper divisors (122981).

85717579 is a wasteful number, since it uses less digits than its factorization.

85717579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122980.

The product of its digits is 617400, while the sum is 49.

The square root of 85717579 is about 9258.3788537735. The cubic root of 85717579 is about 440.9167850830.

The spelling of 85717579 in words is "eighty-five million, seven hundred seventeen thousand, five hundred seventy-nine".