91270816 has 72 divisors (see below), whose sum is σ = 222463584. Its totient is φ = 36092160.

The previous prime is 91270787. The next prime is 91270819. The reversal of 91270816 is 61807219.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91270819) 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, 36651 + ... + 39061.

It is an arithmetic number, because the mean of its divisors is an integer number (3089772).

Almost surely, 2^91270816 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 91270816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111231792).

91270816 is an abundant number, since it is smaller than the sum of its proper divisors (131192768).

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

91270816 is a wasteful number, since it uses less digits than its factorization.

91270816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454 (or 2433 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 91270816 is about 9553.5760843780. The cubic root of 91270816 is about 450.2398984230.

The spelling of 91270816 in words is "ninety-one million, two hundred seventy thousand, eight hundred sixteen".