28252220 has 24 divisors (see below), whose sum is σ = 59945424. Its totient is φ = 11183616.

The previous prime is 28252219. The next prime is 28252243. The reversal of 28252220 is 2225282.

It is a happy number.

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, 5342 + ... + 9221.

It is an arithmetic number, because the mean of its divisors is an integer number (2497726).

Almost surely, 2^28252220 is an apocalyptic number.

28252220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28252220 is an abundant number, since it is smaller than the sum of its proper divisors (31693204).

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

28252220 is a wasteful number, since it uses less digits than its factorization.

28252220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14669 (or 14667 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 28252220 is about 5315.2817422974. The cubic root of 28252220 is about 304.5679450910.

The spelling of 28252220 in words is "twenty-eight million, two hundred fifty-two thousand, two hundred twenty".