91979800 has 48 divisors (see below), whose sum is σ = 233299800. Its totient is φ = 33446400.

The previous prime is 91979731. The next prime is 91979807. The reversal of 91979800 is 897919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91979807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18705 + ... + 23104.

Almost surely, 2^91979800 is an apocalyptic number.

It is an amenable number.

91979800 is an abundant number, since it is smaller than the sum of its proper divisors (141320000).

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

91979800 is a wasteful number, since it uses less digits than its factorization.

91979800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41836 (or 41827 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 91979800 is about 9590.6099910277. The cubic root of 91979800 is about 451.4027012666.

The spelling of 91979800 in words is "ninety-one million, nine hundred seventy-nine thousand, eight hundred".