85317978 has 16 divisors (see below), whose sum is σ = 170881920. Its totient is φ = 28398336.

The previous prime is 85317937. The next prime is 85317979. The reversal of 85317978 is 87971358.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85317979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5575 + ... + 14202.

It is an arithmetic number, because the mean of its divisors is an integer number (10680120).

Almost surely, 2^85317978 is an apocalyptic number.

85317978 is an abundant number, since it is smaller than the sum of its proper divisors (85563942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85317978 is a wasteful number, since it uses less digits than its factorization.

85317978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20501.

The product of its digits is 423360, while the sum is 48.

The square root of 85317978 is about 9236.7731378442. The cubic root of 85317978 is about 440.2305575427.

The spelling of 85317978 in words is "eighty-five million, three hundred seventeen thousand, nine hundred seventy-eight".