91473920 has 48 divisors (see below), whose sum is σ = 219508380. Its totient is φ = 36585472.

The previous prime is 91473913. The next prime is 91473929. The reversal of 91473920 is 2937419.

It can be written as a sum of positive squares in 2 ways, for example, as 87909376 + 3564544 = 9376^2 + 1888^2 .

It is not an unprimeable number, because it can be changed into a prime (91473929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5774 + ... + 14706.

Almost surely, 2^91473920 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 91473920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109754190).

91473920 is an abundant number, since it is smaller than the sum of its proper divisors (128034460).

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

91473920 is an equidigital number, since it uses as much as digits as its factorization.

91473920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8960 (or 8940 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 91473920 is about 9564.1999142636. The cubic root of 91473920 is about 450.5736223929.

The spelling of 91473920 in words is "ninety-one million, four hundred seventy-three thousand, nine hundred twenty".