85687979 has 8 divisors (see below), whose sum is σ = 92557920. Its totient is φ = 78857856.

The previous prime is 85687933. The next prime is 85687997. The reversal of 85687979 is 97978658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85687979 - 2²⁴ = 68910763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85687919) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5399 + ... + 14160.

It is an arithmetic number, because the mean of its divisors is an integer number (11569740).

Almost surely, 2^85687979 is an apocalyptic number.

85687979 is a deficient number, since it is larger than the sum of its proper divisors (6869941).

85687979 is a wasteful number, since it uses less digits than its factorization.

85687979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19909.

The product of its digits is 7620480, while the sum is 59.

The square root of 85687979 is about 9256.7801637502. The cubic root of 85687979 is about 440.8660267689.

The spelling of 85687979 in words is "eighty-five million, six hundred eighty-seven thousand, nine hundred seventy-nine".