91320 has 32 divisors (see below), whose sum is σ = 274320. Its totient is φ = 24320.

The previous prime is 91309. The next prime is 91331. The reversal of 91320 is 2319.

It is an interprime number because it is at equal distance from previous prime (91309) and next prime (91331).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 91320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261 + ... + 500.

2⁹¹³²⁰ is an apocalyptic number.

It is an amenable number.

91320 is an abundant number, since it is smaller than the sum of its proper divisors (183000).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137160).

91320 is a wasteful number, since it uses less digits than its factorization.

91320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 91320 is about 302.1919919521. The cubic root of 91320 is about 45.0320758964.

Adding to 91320 its reverse (2319), we get a palindrome (93639).

The spelling of 91320 in words is "ninety-one thousand, three hundred twenty".