91230216 has 64 divisors (see below), whose sum is σ = 284359680. Its totient is φ = 23695680.

The previous prime is 91230187. The next prime is 91230239. The reversal of 91230216 is 61203219.

It is a super-2 number, since 2×91230216² = 16645904622813312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22836 + ... + 26531.

It is an arithmetic number, because the mean of its divisors is an integer number (4443120).

Almost surely, 2^91230216 is an apocalyptic number.

It is an amenable number.

91230216 is an abundant number, since it is smaller than the sum of its proper divisors (193129464).

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

91230216 is a wasteful number, since it uses less digits than its factorization.

91230216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49394 (or 49390 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 91230216 is about 9551.4509892477. The cubic root of 91230216 is about 450.1731284455.

The spelling of 91230216 in words is "ninety-one million, two hundred thirty thousand, two hundred sixteen".