91012272 has 80 divisors (see below), whose sum is σ = 255087840. Its totient is φ = 27795456.

The previous prime is 91012253. The next prime is 91012277. The reversal of 91012272 is 27221019.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (91012277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97504 + ... + 98432.

It is an arithmetic number, because the mean of its divisors is an integer number (3188598).

Almost surely, 2^91012272 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 91012272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127543920).

91012272 is an abundant number, since it is smaller than the sum of its proper divisors (164075568).

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

91012272 is a wasteful number, since it uses less digits than its factorization.

91012272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 91012272 is about 9540.0352200608. The cubic root of 91012272 is about 449.8143629364.

The spelling of 91012272 in words is "ninety-one million, twelve thousand, two hundred seventy-two".