91128144 has 40 divisors (see below), whose sum is σ = 239281312. Its totient is φ = 29877120.

The previous prime is 91128133. The next prime is 91128203. The reversal of 91128144 is 44182119.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12634 + ... + 18489.

Almost surely, 2^91128144 is an apocalyptic number.

It is an amenable number.

91128144 is an abundant number, since it is smaller than the sum of its proper divisors (148153168).

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

91128144 is a wasteful number, since it uses less digits than its factorization.

91128144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31195 (or 31189 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 91128144 is about 9546.1062219106. The cubic root of 91128144 is about 450.0051752491.

The spelling of 91128144 in words is "ninety-one million, one hundred twenty-eight thousand, one hundred forty-four".