28043220 has 48 divisors (see below), whose sum is σ = 81059328. Its totient is φ = 7236480.

The previous prime is 28043207. The next prime is 28043227. The reversal of 28043220 is 2234082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28043227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5679 + ... + 9398.

It is an arithmetic number, because the mean of its divisors is an integer number (1688736).

Almost surely, 2^28043220 is an apocalyptic number.

28043220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28043220 is an abundant number, since it is smaller than the sum of its proper divisors (53016108).

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

28043220 is a wasteful number, since it uses less digits than its factorization.

28043220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15120 (or 15118 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 28043220 is about 5295.5849535250. The cubic root of 28043220 is about 303.8150565999.

The spelling of 28043220 in words is "twenty-eight million, forty-three thousand, two hundred twenty".