91979700 has 72 divisors (see below), whose sum is σ = 269566080. Its totient is φ = 24211200.

The previous prime is 91979689. The next prime is 91979711. The reversal of 91979700 is 797919.

It is an interprime number because it is at equal distance from previous prime (91979689) and next prime (91979711).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21760 + ... + 25640.

Almost surely, 2^91979700 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 91979700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134783040).

91979700 is an abundant number, since it is smaller than the sum of its proper divisors (177586380).

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

91979700 is a wasteful number, since it uses less digits than its factorization.

91979700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977 (or 3970 counting only the distinct ones).

The product of its (nonzero) digits is 35721, while the sum is 42.

The square root of 91979700 is about 9590.6047775935. The cubic root of 91979700 is about 451.4025376789.

The spelling of 91979700 in words is "ninety-one million, nine hundred seventy-nine thousand, seven hundred".