91838988 has 48 divisors (see below), whose sum is σ = 245790720. Its totient is φ = 29624400.

The previous prime is 91838963. The next prime is 91839017. The reversal of 91838988 is 88983819.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 10368 + ... + 17063.

It is an arithmetic number, because the mean of its divisors is an integer number (5120640).

Almost surely, 2^91838988 is an apocalyptic number.

It is an amenable number.

91838988 is an abundant number, since it is smaller than the sum of its proper divisors (153951732).

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

91838988 is a wasteful number, since it uses less digits than its factorization.

91838988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27475 (or 27467 counting only the distinct ones).

The product of its digits is 995328, while the sum is 54.

The square root of 91838988 is about 9583.2660403434. The cubic root of 91838988 is about 451.1722326167.

The spelling of 91838988 in words is "ninety-one million, eight hundred thirty-eight thousand, nine hundred eighty-eight".