91444572 has 96 divisors (see below), whose sum is σ = 245145600. Its totient is φ = 29465856.

The previous prime is 91444567. The next prime is 91444589. The reversal of 91444572 is 27544419.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 719973 + ... + 720099.

It is an arithmetic number, because the mean of its divisors is an integer number (2553600).

Almost surely, 2^91444572 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 91444572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122572800).

91444572 is an abundant number, since it is smaller than the sum of its proper divisors (153701028).

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

91444572 is a wasteful number, since it uses less digits than its factorization.

91444572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 304 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 91444572 is about 9562.6655279791. The cubic root of 91444572 is about 450.5254307003.

The spelling of 91444572 in words is "ninety-one million, four hundred forty-four thousand, five hundred seventy-two".