91328 has 14 divisors (see below), whose sum is σ = 181356. Its totient is φ = 45632.

The previous prime is 91309. The next prime is 91331. The reversal of 91328 is 82319.

It is an unprimeable number.

91328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650 + ... + 777.

It is an arithmetic number, because the mean of its divisors is an integer number (12954).

2⁹¹³²⁸ is an apocalyptic number.

It is an amenable number.

91328 is a deficient number, since it is larger than the sum of its proper divisors (90028).

91328 is a wasteful number, since it uses less digits than its factorization.

91328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439 (or 1429 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 91328 is about 302.2052282804. The cubic root of 91328 is about 45.0333908551.

Subtracting from 91328 its reverse (82319), we obtain a palindrome (9009).

The spelling of 91328 in words is "ninety-one thousand, three hundred twenty-eight".