28220168 has 64 divisors (see below), whose sum is σ = 59097600. Its totient is φ = 12579840.

The previous prime is 28220147. The next prime is 28220191. The reversal of 28220168 is 86102282.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28220168.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249680 + ... + 249792.

It is an arithmetic number, because the mean of its divisors is an integer number (923400).

Almost surely, 2^28220168 is an apocalyptic number.

It is an amenable number.

28220168 is an abundant number, since it is smaller than the sum of its proper divisors (30877432).

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

28220168 is a wasteful number, since it uses less digits than its factorization.

28220168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 28220168 is about 5312.2658066027. The cubic root of 28220168 is about 304.4527245791.

The spelling of 28220168 in words is "twenty-eight million, two hundred twenty thousand, one hundred sixty-eight".