91128660 has 48 divisors (see below), whose sum is σ = 291613056. Its totient is φ = 20829312.

The previous prime is 91128659. The next prime is 91128673. The reversal of 91128660 is 6682119.

It is a congruent number.

It is an unprimeable number.

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, 108067 + ... + 108906.

It is an arithmetic number, because the mean of its divisors is an integer number (6075272).

Almost surely, 2^91128660 is an apocalyptic number.

It is an amenable number.

91128660 is an abundant number, since it is smaller than the sum of its proper divisors (200484396).

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

91128660 is a wasteful number, since it uses less digits than its factorization.

91128660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216992 (or 216990 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 91128660 is about 9546.1332485986. The cubic root of 91128660 is about 450.0060246107.

The spelling of 91128660 in words is "ninety-one million, one hundred twenty-eight thousand, six hundred sixty".