28086280 has 32 divisors (see below), whose sum is σ = 63345240. Its totient is φ = 11207680.

The previous prime is 28086257. The next prime is 28086281. The reversal of 28086280 is 8268082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17859076 + 10227204 = 4226^2 + 3198^2 .

It is not an unprimeable number, because it can be changed into a prime (28086281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31440 + ... + 32320.

Almost surely, 2^28086280 is an apocalyptic number.

28086280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28086280 is an abundant number, since it is smaller than the sum of its proper divisors (35258960).

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

28086280 is a wasteful number, since it uses less digits than its factorization.

28086280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689 (or 1685 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 28086280 is about 5299.6490449840. The cubic root of 28086280 is about 303.9704784352.

The spelling of 28086280 in words is "twenty-eight million, eighty-six thousand, two hundred eighty".