91098816 has 56 divisors (see below), whose sum is σ = 241736880. Its totient is φ = 30277632.

The previous prime is 91098781. The next prime is 91098829. The reversal of 91098816 is 61889019.

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, 118080 + ... + 118848.

It is an arithmetic number, because the mean of its divisors is an integer number (4316730).

Almost surely, 2^91098816 is an apocalyptic number.

91098816 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

91098816 is an abundant number, since it is smaller than the sum of its proper divisors (150638064).

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

91098816 is a wasteful number, since it uses less digits than its factorization.

91098816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 91098816 is about 9544.5699745981. The cubic root of 91098816 is about 449.9568946365.

The spelling of 91098816 in words is "ninety-one million, ninety-eight thousand, eight hundred sixteen".