91680228 has 48 divisors (see below), whose sum is σ = 244124160. Its totient is φ = 29732832.

The previous prime is 91680217. The next prime is 91680271. The reversal of 91680228 is 82208619.

It is a super-2 number, since 2×91680228² = 16810528412263968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91680192 and 91680201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7476 + ... + 15467.

It is an arithmetic number, because the mean of its divisors is an integer number (5085920).

Almost surely, 2^91680228 is an apocalyptic number.

It is an amenable number.

91680228 is an abundant number, since it is smaller than the sum of its proper divisors (152443932).

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

91680228 is a wasteful number, since it uses less digits than its factorization.

91680228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22993 (or 22985 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 91680228 is about 9574.9792689071. The cubic root of 91680228 is about 450.9121055586.

The spelling of 91680228 in words is "ninety-one million, six hundred eighty thousand, two hundred twenty-eight".