28283220 has 72 divisors (see below), whose sum is σ = 98052864. Its totient is φ = 6464448.

The previous prime is 28283209. The next prime is 28283231. The reversal of 28283220 is 2238282.

It is an interprime number because it is at equal distance from previous prime (28283209) and next prime (28283231).

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 23 ways as a sum of consecutive naturals, for example, 9964 + ... + 12483.

Almost surely, 2^28283220 is an apocalyptic number.

28283220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28283220 is an abundant number, since it is smaller than the sum of its proper divisors (69769644).

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

28283220 is a wasteful number, since it uses less digits than its factorization.

28283220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22469 (or 22464 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28283220 is about 5318.1970629152. The cubic root of 28283220 is about 304.6793010023.

The spelling of 28283220 in words is "twenty-eight million, two hundred eighty-three thousand, two hundred twenty".