91868028 has 24 divisors (see below), whose sum is σ = 244981632. Its totient is φ = 26247984.

The previous prime is 91868009. The next prime is 91868041. The reversal of 91868028 is 82086819.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 546750 + ... + 546917.

It is an arithmetic number, because the mean of its divisors is an integer number (10207568).

Almost surely, 2^91868028 is an apocalyptic number.

It is an amenable number.

91868028 is an abundant number, since it is smaller than the sum of its proper divisors (153113604).

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

91868028 is a wasteful number, since it uses less digits than its factorization.

91868028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093681 (or 1093679 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 91868028 is about 9584.7810616623. The cubic root of 91868028 is about 451.2197819970.

The spelling of 91868028 in words is "ninety-one million, eight hundred sixty-eight thousand, twenty-eight".