91128572 has 12 divisors (see below), whose sum is σ = 159550776. Its totient is φ = 45542640.

The previous prime is 91128523. The next prime is 91128577. The reversal of 91128572 is 27582119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91128577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7463 + ... + 15425.

It is an arithmetic number, because the mean of its divisors is an integer number (13295898).

Almost surely, 2^91128572 is an apocalyptic number.

It is an amenable number.

91128572 is a deficient number, since it is larger than the sum of its proper divisors (68422204).

91128572 is a wasteful number, since it uses less digits than its factorization.

91128572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10828 (or 10826 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 91128572 is about 9546.1286394014. The cubic root of 91128572 is about 450.0058797586.

The spelling of 91128572 in words is "ninety-one million, one hundred twenty-eight thousand, five hundred seventy-two".