91444072 has 16 divisors (see below), whose sum is σ = 172094400. Its totient is φ = 45552240.

The previous prime is 91444061. The next prime is 91444081. The reversal of 91444072 is 27044419.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18922 + ... + 23257.

It is an arithmetic number, because the mean of its divisors is an integer number (10755900).

Almost surely, 2^91444072 is an apocalyptic number.

It is an amenable number.

91444072 is a deficient number, since it is larger than the sum of its proper divisors (80650328).

91444072 is a wasteful number, since it uses less digits than its factorization.

91444072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42456 (or 42452 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 91444072 is about 9562.6393846051. The cubic root of 91444072 is about 450.5246095722.

The spelling of 91444072 in words is "ninety-one million, four hundred forty-four thousand, seventy-two".