28122180 has 24 divisors (see below), whose sum is σ = 78742272. Its totient is φ = 7499232.

The previous prime is 28122161. The next prime is 28122191. The reversal of 28122180 is 8122182.

It is a self number, because there is not a number n which added to its sum of digits gives 28122180.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234292 + ... + 234411.

It is an arithmetic number, because the mean of its divisors is an integer number (3280928).

Almost surely, 2^28122180 is an apocalyptic number.

28122180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28122180 is an abundant number, since it is smaller than the sum of its proper divisors (50620092).

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

28122180 is a wasteful number, since it uses less digits than its factorization.

28122180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468715 (or 468713 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 28122180 is about 5303.0349800845. The cubic root of 28122180 is about 304.0999354036.

The spelling of 28122180 in words is "twenty-eight million, one hundred twenty-two thousand, one hundred eighty".