91168220 has 96 divisors (see below), whose sum is σ = 227598336. Its totient is φ = 30240000.

The previous prime is 91168211. The next prime is 91168243. The reversal of 91168220 is 2286119.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 363095 + ... + 363345.

It is an arithmetic number, because the mean of its divisors is an integer number (2370816).

Almost surely, 2^91168220 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 91168220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113799168).

91168220 is an abundant number, since it is smaller than the sum of its proper divisors (136430116).

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

91168220 is a wasteful number, since it uses less digits than its factorization.

91168220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 91168220 is about 9548.2050669223. The cubic root of 91168220 is about 450.0711327882.

The spelling of 91168220 in words is "ninety-one million, one hundred sixty-eight thousand, two hundred twenty".