91428180 has 48 divisors (see below), whose sum is σ = 260838144. Its totient is φ = 23920000.

The previous prime is 91428163. The next prime is 91428241. The reversal of 91428180 is 8182419.

It is a super-2 number, since 2×91428180² = 16718224196224800, which contains 22 as substring.

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, 11196 + ... + 17555.

It is an arithmetic number, because the mean of its divisors is an integer number (5434128).

Almost surely, 2^91428180 is an apocalyptic number.

It is an amenable number.

91428180 is an abundant number, since it is smaller than the sum of its proper divisors (169409964).

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

91428180 is a wasteful number, since it uses less digits than its factorization.

91428180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28816 (or 28814 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 91428180 is about 9561.8084063633. The cubic root of 91428180 is about 450.4985092767.

The spelling of 91428180 in words is "ninety-one million, four hundred twenty-eight thousand, one hundred eighty".