91872120 has 64 divisors (see below), whose sum is σ = 287608320. Its totient is φ = 23433344.

The previous prime is 91872113. The next prime is 91872173. The reversal of 91872120 is 2127819.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13884 + ... + 19403.

It is an arithmetic number, because the mean of its divisors is an integer number (4493880).

Almost surely, 2^91872120 is an apocalyptic number.

It is an amenable number.

91872120 is an abundant number, since it is smaller than the sum of its proper divisors (195736200).

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

91872120 is a wasteful number, since it uses less digits than its factorization.

91872120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33324 (or 33320 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 91872120 is about 9584.9945226901. The cubic root of 91872120 is about 451.2264813314.

Adding to 91872120 its reverse (2127819), we get a palindrome (93999939).

The spelling of 91872120 in words is "ninety-one million, eight hundred seventy-two thousand, one hundred twenty".