91897792 has 28 divisors (see below), whose sum is σ = 208412080. Its totient is φ = 39384576.

The previous prime is 91897789. The next prime is 91897829. The reversal of 91897792 is 29779819.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

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, 102117 + ... + 103012.

Almost surely, 2^91897792 is an apocalyptic number.

It is an amenable number.

91897792 is an abundant number, since it is smaller than the sum of its proper divisors (116514288).

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

91897792 is a wasteful number, since it uses less digits than its factorization.

91897792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205148 (or 205138 counting only the distinct ones).

The product of its digits is 571536, while the sum is 52.

The square root of 91897792 is about 9586.3336057118. Note that the first 3 decimals coincide. The cubic root of 91897792 is about 451.2685064399.

The spelling of 91897792 in words is "ninety-one million, eight hundred ninety-seven thousand, seven hundred ninety-two".