90191232 has 80 divisors (see below), whose sum is σ = 268438500. Its totient is φ = 30060288.

The previous prime is 90191201. The next prime is 90191249. The reversal of 90191232 is 23219109.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 90191196 and 90191205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6019 + ... + 14717.

Almost surely, 2^90191232 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 90191232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134219250).

90191232 is an abundant number, since it is smaller than the sum of its proper divisors (178247268).

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

90191232 is an equidigital number, since it uses as much as digits as its factorization.

90191232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8725 (or 8704 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 90191232 is about 9496.9064436794. The cubic root of 90191232 is about 448.4576530750.

The spelling of 90191232 in words is "ninety million, one hundred ninety-one thousand, two hundred thirty-two".