91123272 has 64 divisors (see below), whose sum is σ = 256632000. Its totient is φ = 29953152.

The previous prime is 91123243. The next prime is 91123289. The reversal of 91123272 is 27232119.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12879 + ... + 18657.

It is an arithmetic number, because the mean of its divisors is an integer number (4009875).

Almost surely, 2^91123272 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 91123272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128316000).

91123272 is an abundant number, since it is smaller than the sum of its proper divisors (165508728).

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

91123272 is a wasteful number, since it uses less digits than its factorization.

91123272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5867 (or 5857 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 91123272 is about 9545.8510359213. The cubic root of 91123272 is about 449.9971555376.

The spelling of 91123272 in words is "ninety-one million, one hundred twenty-three thousand, two hundred seventy-two".