85115778 has 64 divisors (see below), whose sum is σ = 198070272. Its totient is φ = 24126080.

The previous prime is 85115759. The next prime is 85115837. The reversal of 85115778 is 87751158.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70750 + ... + 71942.

It is an arithmetic number, because the mean of its divisors is an integer number (3094848).

Almost surely, 2^85115778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85115778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99035136).

85115778 is an abundant number, since it is smaller than the sum of its proper divisors (112954494).

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

85115778 is a wasteful number, since it uses less digits than its factorization.

85115778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279.

The product of its digits is 78400, while the sum is 42.

The square root of 85115778 is about 9225.8212642561. The cubic root of 85115778 is about 439.8825065072.

The spelling of 85115778 in words is "eighty-five million, one hundred fifteen thousand, seven hundred seventy-eight".