91891200 has 120 divisors (see below), whose sum is σ = 303683688. Its totient is φ = 24494080.

The previous prime is 91891139. The next prime is 91891211. The reversal of 91891200 is 219819.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37204 + ... + 39596.

Almost surely, 2^91891200 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 91891200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151841844).

91891200 is an abundant number, since it is smaller than the sum of its proper divisors (211792488).

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

91891200 is a wasteful number, since it uses less digits than its factorization.

91891200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 91891200 is about 9585.9897767523. The cubic root of 91891200 is about 451.2577160714.

The spelling of 91891200 in words is "ninety-one million, eight hundred ninety-one thousand, two hundred".