91078878 has 24 divisors (see below), whose sum is σ = 200224584. Its totient is φ = 27599440.

The previous prime is 91078861. The next prime is 91078907. The reversal of 91078878 is 87887019.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62001 + ... + 63452.

It is an arithmetic number, because the mean of its divisors is an integer number (8342691).

Almost surely, 2^91078878 is an apocalyptic number.

91078878 is an abundant number, since it is smaller than the sum of its proper divisors (109145706).

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

91078878 is a wasteful number, since it uses less digits than its factorization.

91078878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125480 (or 125469 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 91078878 is about 9543.5254492247. The cubic root of 91078878 is about 449.9240661999.

The spelling of 91078878 in words is "ninety-one million, seventy-eight thousand, eight hundred seventy-eight".