91900872 has 192 divisors, whose sum is σ = 313272000. Its totient is φ = 24820992.

The previous prime is 91900849. The next prime is 91900873. The reversal of 91900872 is 27800919.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91900873) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 200868 + ... + 201324.

It is an arithmetic number, because the mean of its divisors is an integer number (1631625).

Almost surely, 2^91900872 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 91900872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156636000).

91900872 is an abundant number, since it is smaller than the sum of its proper divisors (221371128).

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

91900872 is a wasteful number, since it uses less digits than its factorization.

91900872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 91900872 is about 9586.4942497245. The cubic root of 91900872 is about 451.2735478794.

The spelling of 91900872 in words is "ninety-one million, nine hundred thousand, eight hundred seventy-two".