91239872 has 28 divisors (see below), whose sum is σ = 182825136. Its totient is φ = 45173760.

The previous prime is 91239859. The next prime is 91239893. The reversal of 91239872 is 27893219.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329 + ... + 13512.

Almost surely, 2^91239872 is an apocalyptic number.

It is an amenable number.

91239872 is an abundant number, since it is smaller than the sum of its proper divisors (91585264).

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

91239872 is a wasteful number, since it uses less digits than its factorization.

91239872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13956 (or 13946 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 91239872 is about 9551.9564488119. The cubic root of 91239872 is about 450.1890103122.

The spelling of 91239872 in words is "ninety-one million, two hundred thirty-nine thousand, eight hundred seventy-two".