91577872 has 20 divisors (see below), whose sum is σ = 186771280. Its totient is φ = 43378848.

The previous prime is 91577867. The next prime is 91577873. The reversal of 91577872 is 27877519.

It is not an unprimeable number, because it can be changed into a prime (91577873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150318 + ... + 150925.

It is an arithmetic number, because the mean of its divisors is an integer number (9338564).

Almost surely, 2^91577872 is an apocalyptic number.

It is an amenable number.

91577872 is an abundant number, since it is smaller than the sum of its proper divisors (95193408).

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

91577872 is a wasteful number, since it uses less digits than its factorization.

91577872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301270 (or 301264 counting only the distinct ones).

The product of its digits is 246960, while the sum is 46.

The square root of 91577872 is about 9569.6328038227. The cubic root of 91577872 is about 450.7442367712.

It can be divided in two parts, 915 and 77872, that added together give a palindrome (78787).

The spelling of 91577872 in words is "ninety-one million, five hundred seventy-seven thousand, eight hundred seventy-two".