91830120 has 32 divisors (see below), whose sum is σ = 275490720. Its totient is φ = 24488000.

The previous prime is 91830113. The next prime is 91830149. The reversal of 91830120 is 2103819.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 382506 + ... + 382745.

It is an arithmetic number, because the mean of its divisors is an integer number (8609085).

Almost surely, 2^91830120 is an apocalyptic number.

It is an amenable number.

91830120 is an abundant number, since it is smaller than the sum of its proper divisors (183660600).

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

91830120 is a wasteful number, since it uses less digits than its factorization.

91830120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765265 (or 765261 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 91830120 is about 9582.8033476640. The cubic root of 91830120 is about 451.1577103743.

Adding to 91830120 its reverse (2103819), we get a palindrome (93933939).

The spelling of 91830120 in words is "ninety-one million, eight hundred thirty thousand, one hundred twenty".