91800774 has 96 divisors (see below), whose sum is σ = 230053824. Its totient is φ = 26231040.

The previous prime is 91800773. The next prime is 91800809. The reversal of 91800774 is 47700819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91800773) 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 47 ways as a sum of consecutive naturals, for example, 198904 + ... + 199364.

It is an arithmetic number, because the mean of its divisors is an integer number (2396394).

Almost surely, 2^91800774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91800774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115026912).

91800774 is an abundant number, since it is smaller than the sum of its proper divisors (138253050).

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

91800774 is a wasteful number, since it uses less digits than its factorization.

91800774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 91800774 is about 9581.2720449844. The cubic root of 91800774 is about 451.1096466789.

The spelling of 91800774 in words is "ninety-one million, eight hundred thousand, seven hundred seventy-four".