91728084 has 48 divisors (see below), whose sum is σ = 245121408. Its totient is φ = 26153088.

The previous prime is 91728083. The next prime is 91728097. The reversal of 91728084 is 48082719.

It is a super-2 number, since 2×91728084² = 16828082788622112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91728083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56062 + ... + 57674.

It is an arithmetic number, because the mean of its divisors is an integer number (5106696).

Almost surely, 2^91728084 is an apocalyptic number.

It is an amenable number.

91728084 is an abundant number, since it is smaller than the sum of its proper divisors (153393324).

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

91728084 is a wasteful number, since it uses less digits than its factorization.

91728084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 91728084 is about 9577.4779561219. The cubic root of 91728084 is about 450.9905488487.

The spelling of 91728084 in words is "ninety-one million, seven hundred twenty-eight thousand, eighty-four".