91273920 has 112 divisors (see below), whose sum is σ = 299240448. Its totient is φ = 23546880.

The previous prime is 91273909. The next prime is 91273927. The reversal of 91273920 is 2937219.

It is not an unprimeable number, because it can be changed into a prime (91273927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28227 + ... + 31293.

Almost surely, 2^91273920 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 91273920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149620224).

91273920 is an abundant number, since it is smaller than the sum of its proper divisors (207966528).

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

91273920 is a wasteful number, since it uses less digits than its factorization.

91273920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3118 (or 3108 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 91273920 is about 9553.7385352541. The cubic root of 91273920 is about 450.2450023868.

The spelling of 91273920 in words is "ninety-one million, two hundred seventy-three thousand, nine hundred twenty".