28843280 has 20 divisors (see below), whose sum is σ = 67060812. Its totient is φ = 11537280.

The previous prime is 28843261. The next prime is 28843291. The reversal of 28843280 is 8234882.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 22771984 = 2464^2 + 4772^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 28843280.

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, 180191 + ... + 180350.

Almost surely, 2^28843280 is an apocalyptic number.

28843280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28843280 is an abundant number, since it is smaller than the sum of its proper divisors (38217532).

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

28843280 is a wasteful number, since it uses less digits than its factorization.

28843280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360554 (or 360548 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 28843280 is about 5370.5940081149. The cubic root of 28843280 is about 306.6772418113.

The spelling of 28843280 in words is "twenty-eight million, eight hundred forty-three thousand, two hundred eighty".