28552220 has 24 divisors (see below), whose sum is σ = 60119808. Its totient is φ = 11390400.

The previous prime is 28552217. The next prime is 28552243. The reversal of 28552220 is 2225582.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28552220.

It is a congruent 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, 6725 + ... + 10115.

It is an arithmetic number, because the mean of its divisors is an integer number (2504992).

Almost surely, 2^28552220 is an apocalyptic number.

28552220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28552220 is an abundant number, since it is smaller than the sum of its proper divisors (31567588).

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

28552220 is a wasteful number, since it uses less digits than its factorization.

28552220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821 (or 3819 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 28552220 is about 5343.4277388208. The cubic root of 28552220 is about 305.6421836043.

The spelling of 28552220 in words is "twenty-eight million, five hundred fifty-two thousand, two hundred twenty".