91284128 has 24 divisors (see below), whose sum is σ = 193540788. Its totient is φ = 42130944.

The previous prime is 91284097. The next prime is 91284131. The reversal of 91284128 is 82148219.

It can be written as a sum of positive squares in 2 ways, for example, as 90859024 + 425104 = 9532^2 + 652^2 .

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 3 ways as a sum of consecutive naturals, for example, 109301 + ... + 110132.

Almost surely, 2^91284128 is an apocalyptic number.

It is an amenable number.

91284128 is an abundant number, since it is smaller than the sum of its proper divisors (102256660).

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

91284128 is a wasteful number, since it uses less digits than its factorization.

91284128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219456 (or 219448 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 91284128 is about 9554.2727614403. The cubic root of 91284128 is about 450.2617867711.

The spelling of 91284128 in words is "ninety-one million, two hundred eighty-four thousand, one hundred twenty-eight".