91730 has 8 divisors (see below), whose sum is σ = 165132. Its totient is φ = 36688.

The previous prime is 91711. The next prime is 91733. The reversal of 91730 is 3719.

It can be written as a sum of positive squares in 2 ways, for example, as 78961 + 12769 = 281^2 + 113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91733) 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, 4577 + ... + 4596.

2⁹¹⁷³⁰ is an apocalyptic number.

91730 is a deficient number, since it is larger than the sum of its proper divisors (73402).

91730 is a wasteful number, since it uses less digits than its factorization.

91730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9180.

The product of its (nonzero) digits is 189, while the sum is 20.

The square root of 91730 is about 302.8696089079. The cubic root of 91730 is about 45.0993688897.

Adding to 91730 its product of nonzero digits (189), we get a palindrome (91919).

It can be divided in two parts, 91 and 730, that multiplied together give a triangular number (66430 = T₃₆₄).

The spelling of 91730 in words is "ninety-one thousand, seven hundred thirty".