91689960 has 128 divisors (see below), whose sum is σ = 290304000. Its totient is φ = 23122176.

The previous prime is 91689931. The next prime is 91689977. The reversal of 91689960 is 6998619.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383521 + ... + 383759.

It is an arithmetic number, because the mean of its divisors is an integer number (2268000).

Almost surely, 2^91689960 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91689960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145152000).

91689960 is an abundant number, since it is smaller than the sum of its proper divisors (198614040).

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

91689960 is a wasteful number, since it uses less digits than its factorization.

91689960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 91689960 is about 9575.4874549550. The cubic root of 91689960 is about 450.9280600032.

The spelling of 91689960 in words is "ninety-one million, six hundred eighty-nine thousand, nine hundred sixty".