91216288 has 24 divisors (see below), whose sum is σ = 190146852. Its totient is φ = 42925056.

The previous prime is 91216273. The next prime is 91216297. The reversal of 91216288 is 88261219.

It can be written as a sum of positive squares in 2 ways, for example, as 91164304 + 51984 = 9548^2 + 228^2 .

It is a super-2 number, since 2×91216288² = 16640822392997888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83295 + ... + 84382.

Almost surely, 2^91216288 is an apocalyptic number.

It is an amenable number.

91216288 is an abundant number, since it is smaller than the sum of its proper divisors (98930564).

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

91216288 is a wasteful number, since it uses less digits than its factorization.

91216288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167704 (or 167696 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 91216288 is about 9550.7218575352. The cubic root of 91216288 is about 450.1502181616.

The spelling of 91216288 in words is "ninety-one million, two hundred sixteen thousand, two hundred eighty-eight".