28180218 has 16 divisors (see below), whose sum is σ = 61484256. Its totient is φ = 8539440.

The previous prime is 28180193. The next prime is 28180219. The reversal of 28180218 is 81208182.

It is not an unprimeable number, because it can be changed into a prime (28180219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213421 + ... + 213552.

It is an arithmetic number, because the mean of its divisors is an integer number (3842766).

Almost surely, 2^28180218 is an apocalyptic number.

28180218 is an abundant number, since it is smaller than the sum of its proper divisors (33304038).

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

28180218 is a wasteful number, since it uses less digits than its factorization.

28180218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426989.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 28180218 is about 5308.5043091251. The cubic root of 28180218 is about 304.3089901366.

The spelling of 28180218 in words is "twenty-eight million, one hundred eighty thousand, two hundred eighteen".