91865312 has 96 divisors (see below), whose sum is σ = 235436544. Its totient is φ = 34214400.

The previous prime is 91865303. The next prime is 91865321. The reversal of 91865312 is 21356819.

It is an interprime number because it is at equal distance from previous prime (91865303) and next prime (91865321).

It is a congruent number.

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, 55862 + ... + 57482.

It is an arithmetic number, because the mean of its divisors is an integer number (2452464).

Almost surely, 2^91865312 is an apocalyptic number.

91865312 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91865312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117718272).

91865312 is an abundant number, since it is smaller than the sum of its proper divisors (143571232).

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

91865312 is a wasteful number, since it uses less digits than its factorization.

91865312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1664 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 91865312 is about 9584.6393776709. The cubic root of 91865312 is about 451.2153353103.

The spelling of 91865312 in words is "ninety-one million, eight hundred sixty-five thousand, three hundred twelve".