91638882 has 24 divisors (see below), whose sum is σ = 200119296. Its totient is φ = 30305016.

The previous prime is 91638863. The next prime is 91638901. The reversal of 91638882 is 28883619.

91638882 is a `hidden beast` number, since 9 + 1 + 638 + 8 + 8 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (91638863) and next prime (91638901).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17758 + ... + 22329.

It is an arithmetic number, because the mean of its divisors is an integer number (8338304).

Almost surely, 2^91638882 is an apocalyptic number.

91638882 is an abundant number, since it is smaller than the sum of its proper divisors (108480414).

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

91638882 is a wasteful number, since it uses less digits than its factorization.

91638882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40222 (or 40219 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 91638882 is about 9572.8199607012. The cubic root of 91638882 is about 450.8443111692.

The spelling of 91638882 in words is "ninety-one million, six hundred thirty-eight thousand, eight hundred eighty-two".