28282220 has 48 divisors (see below), whose sum is σ = 63358848. Its totient is φ = 10567680.

The previous prime is 28282217. The next prime is 28282253. The reversal of 28282220 is 2228282.

It is a self number, because there is not a number n which added to its sum of digits gives 28282220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65405 + ... + 65835.

It is an arithmetic number, because the mean of its divisors is an integer number (1319976).

Almost surely, 2^28282220 is an apocalyptic number.

28282220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28282220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31679424).

28282220 is an abundant number, since it is smaller than the sum of its proper divisors (35076628).

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

28282220 is a wasteful number, since it uses less digits than its factorization.

28282220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 28282220 is about 5318.1030452597. The cubic root of 28282220 is about 304.6757101465.

The spelling of 28282220 in words is "twenty-eight million, two hundred eighty-two thousand, two hundred twenty".