91915992 has 256 divisors, whose sum is σ = 315187200. Its totient is φ = 24261120.

The previous prime is 91915987. The next prime is 91915997. The reversal of 91915992 is 29951919.

It is an interprime number because it is at equal distance from previous prime (91915987) and next prime (91915997).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91915997) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1734238 + ... + 1734290.

It is an arithmetic number, because the mean of its divisors is an integer number (1231200).

Almost surely, 2^91915992 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 91915992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157593600).

91915992 is an abundant number, since it is smaller than the sum of its proper divisors (223271208).

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

91915992 is a wasteful number, since it uses less digits than its factorization.

91915992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 133 counting only the distinct ones).

The product of its digits is 65610, while the sum is 45.

The square root of 91915992 is about 9587.2828267450. The cubic root of 91915992 is about 451.2982951305.

The spelling of 91915992 in words is "ninety-one million, nine hundred fifteen thousand, nine hundred ninety-two".