86991774 has 16 divisors (see below), whose sum is σ = 174536208. Its totient is φ = 28905152.

The previous prime is 86991767. The next prime is 86991781. The reversal of 86991774 is 47719968.

It is an interprime number because it is at equal distance from previous prime (86991767) and next prime (86991781).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20967 + ... + 24770.

It is an arithmetic number, because the mean of its divisors is an integer number (10908513).

Almost surely, 2^86991774 is an apocalyptic number.

86991774 is an abundant number, since it is smaller than the sum of its proper divisors (87544434).

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

86991774 is a wasteful number, since it uses less digits than its factorization.

86991774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46059.

The product of its digits is 762048, while the sum is 51.

The square root of 86991774 is about 9326.9380827794. The cubic root of 86991774 is about 443.0907962894.

The spelling of 86991774 in words is "eighty-six million, nine hundred ninety-one thousand, seven hundred seventy-four".