91800816 has 40 divisors (see below), whose sum is σ = 251104464. Its totient is φ = 28800000.

The previous prime is 91800809. The next prime is 91800817. The reversal of 91800816 is 61800819.

91800816 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91800817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55435 + ... + 57066.

Almost surely, 2^91800816 is an apocalyptic number.

It is an amenable number.

91800816 is an abundant number, since it is smaller than the sum of its proper divisors (159303648).

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

91800816 is a wasteful number, since it uses less digits than its factorization.

91800816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112529 (or 112523 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 91800816 is about 9581.2742367600. The cubic root of 91800816 is about 451.1097154750.

The spelling of 91800816 in words is "ninety-one million, eight hundred thousand, eight hundred sixteen".