91673128 has 16 divisors (see below), whose sum is σ = 172025280. Its totient is φ = 45799728.

The previous prime is 91673123. The next prime is 91673143. The reversal of 91673128 is 82137619.

It is not an unprimeable number, because it can be changed into a prime (91673123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8001 + ... + 15727.

It is an arithmetic number, because the mean of its divisors is an integer number (10751580).

Almost surely, 2^91673128 is an apocalyptic number.

It is an amenable number.

91673128 is a deficient number, since it is larger than the sum of its proper divisors (80352152).

91673128 is a wasteful number, since it uses less digits than its factorization.

91673128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9216 (or 9212 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 91673128 is about 9574.6085037457. The cubic root of 91673128 is about 450.9004652494.

The spelling of 91673128 in words is "ninety-one million, six hundred seventy-three thousand, one hundred twenty-eight".