91166720 has 96 divisors (see below), whose sum is σ = 227026800. Its totient is φ = 35094528.

The previous prime is 91166689. The next prime is 91166737. The reversal of 91166720 is 2766119.

It is a happy number.

It is a super-2 number, since 2×91166720² = 16622741671116800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 296807 + ... + 297113.

Almost surely, 2^91166720 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 91166720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113513400).

91166720 is an abundant number, since it is smaller than the sum of its proper divisors (135860080).

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

91166720 is a wasteful number, since it uses less digits than its factorization.

91166720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 91166720 is about 9548.1265178044. The cubic root of 91166720 is about 450.0686644192.

The spelling of 91166720 in words is "ninety-one million, one hundred sixty-six thousand, seven hundred twenty".