91915472 has 60 divisors (see below), whose sum is σ = 197557668. Its totient is φ = 41395200.

The previous prime is 91915463. The next prime is 91915477. The reversal of 91915472 is 27451919.

It can be written as a sum of positive squares in 2 ways, for example, as 82156096 + 9759376 = 9064^2 + 3124^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91915477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381272 + ... + 381512.

Almost surely, 2^91915472 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 91915472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98778834).

91915472 is an abundant number, since it is smaller than the sum of its proper divisors (105642196).

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

91915472 is a wasteful number, since it uses less digits than its factorization.

91915472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 451 counting only the distinct ones).

The product of its digits is 22680, while the sum is 38.

The square root of 91915472 is about 9587.2557074483. The cubic root of 91915472 is about 451.2974440797.

The spelling of 91915472 in words is "ninety-one million, nine hundred fifteen thousand, four hundred seventy-two".