91878888 has 16 divisors (see below), whose sum is σ = 229697280. Its totient is φ = 30626288.

The previous prime is 91878877. The next prime is 91878893. The reversal of 91878888 is 88887819.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1914120 + ... + 1914167.

It is an arithmetic number, because the mean of its divisors is an integer number (14356080).

Almost surely, 2^91878888 is an apocalyptic number.

It is an amenable number.

91878888 is an abundant number, since it is smaller than the sum of its proper divisors (137818392).

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

91878888 is a wasteful number, since it uses less digits than its factorization.

91878888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3828296 (or 3828292 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 57.

The square root of 91878888 is about 9585.3475680332. The cubic root of 91878888 is about 451.2375613190.

The spelling of 91878888 in words is "ninety-one million, eight hundred seventy-eight thousand, eight hundred eighty-eight".