91865088 has 180 divisors, whose sum is σ = 306699120. Its totient is φ = 25952256.

The previous prime is 91865087. The next prime is 91865089. The reversal of 91865088 is 88056819.

It is an interprime number because it is at equal distance from previous prime (91865087) and next prime (91865089).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91865083) 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, 1032148 + ... + 1032236.

It is an arithmetic number, because the mean of its divisors is an integer number (1703884).

Almost surely, 2^91865088 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 91865088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153349560).

91865088 is an abundant number, since it is smaller than the sum of its proper divisors (214834032).

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

91865088 is an equidigital number, since it uses as much as digits as its factorization.

91865088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 91865088 is about 9584.6276922998. The cubic root of 91865088 is about 451.2149685694.

The spelling of 91865088 in words is "ninety-one million, eight hundred sixty-five thousand, eighty-eight".