28806220 has 24 divisors (see below), whose sum is σ = 60606000. Its totient is φ = 11500992.

The previous prime is 28806209. The next prime is 28806233. The reversal of 28806220 is 2260882.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13806 + ... + 15754.

It is an arithmetic number, because the mean of its divisors is an integer number (2525250).

Almost surely, 2^28806220 is an apocalyptic number.

28806220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28806220 is an abundant number, since it is smaller than the sum of its proper divisors (31799780).

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

28806220 is a wasteful number, since it uses less digits than its factorization.

28806220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697 (or 2695 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28806220 is about 5367.1426289973. The cubic root of 28806220 is about 306.5458382425.

The spelling of 28806220 in words is "twenty-eight million, eight hundred six thousand, two hundred twenty".