91939800 has 96 divisors (see below), whose sum is σ = 294266880. Its totient is φ = 23721600.

The previous prime is 91939781. The next prime is 91939807. The reversal of 91939800 is 893919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16129 + ... + 21071.

It is an arithmetic number, because the mean of its divisors is an integer number (3065280).

Almost surely, 2^91939800 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 91939800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147133440).

91939800 is an abundant number, since it is smaller than the sum of its proper divisors (202327080).

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

91939800 is a wasteful number, since it uses less digits than its factorization.

91939800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993 (or 4984 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 91939800 is about 9588.5243911668. The cubic root of 91939800 is about 451.3372567303.

The spelling of 91939800 in words is "ninety-one million, nine hundred thirty-nine thousand, eight hundred".