28828220 has 12 divisors (see below), whose sum is σ = 60539304. Its totient is φ = 11531280.

The previous prime is 28828213. The next prime is 28828231. The reversal of 28828220 is 2282882.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720686 + ... + 720725.

It is an arithmetic number, because the mean of its divisors is an integer number (5044942).

Almost surely, 2^28828220 is an apocalyptic number.

28828220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28828220 is an abundant number, since it is smaller than the sum of its proper divisors (31711084).

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

28828220 is a wasteful number, since it uses less digits than its factorization.

28828220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441420 (or 1441418 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 32.

The square root of 28828220 is about 5369.1917455051. The cubic root of 28828220 is about 306.6238571832.

The spelling of 28828220 in words is "twenty-eight million, eight hundred twenty-eight thousand, two hundred twenty".