91372872 has 64 divisors (see below), whose sum is σ = 237404160. Its totient is φ = 29275200.

The previous prime is 91372861. The next prime is 91372873. The reversal of 91372872 is 27827319.

It is a self number, because there is not a number n which added to its sum of digits gives 91372872.

It is not an unprimeable number, because it can be changed into a prime (91372873) 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 15 ways as a sum of consecutive naturals, for example, 141783 + ... + 142425.

It is an arithmetic number, because the mean of its divisors is an integer number (3709440).

Almost surely, 2^91372872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91372872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118702080).

91372872 is an abundant number, since it is smaller than the sum of its proper divisors (146031288).

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

91372872 is a wasteful number, since it uses less digits than its factorization.

91372872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 870 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 91372872 is about 9558.9158381063. The cubic root of 91372872 is about 450.4076503553.

The spelling of 91372872 in words is "ninety-one million, three hundred seventy-two thousand, eight hundred seventy-two".