91688850 has 72 divisors (see below), whose sum is σ = 268746192. Its totient is φ = 22226400.

The previous prime is 91688843. The next prime is 91688867. The reversal of 91688850 is 5888619.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 91688796 and 91688805.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4312 + ... + 14211.

It is an arithmetic number, because the mean of its divisors is an integer number (3732586).

Almost surely, 2^91688850 is an apocalyptic number.

91688850 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91688850 is an abundant number, since it is smaller than the sum of its proper divisors (177057342).

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

91688850 is a wasteful number, since it uses less digits than its factorization.

91688850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18552 (or 18544 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 91688850 is about 9575.4294942838. The cubic root of 91688850 is about 450.9262403486.

The spelling of 91688850 in words is "ninety-one million, six hundred eighty-eight thousand, eight hundred fifty".