28280656 has 40 divisors (see below), whose sum is σ = 58449384. Its totient is φ = 13209600.

The previous prime is 28280621. The next prime is 28280669. The reversal of 28280656 is 65608282.

It can be written as a sum of positive squares in 4 ways, for example, as 19184400 + 9096256 = 4380^2 + 3016^2 .

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 7 ways as a sum of consecutive naturals, for example, 46756 + ... + 47356.

Almost surely, 2^28280656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28280656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29224692).

28280656 is an abundant number, since it is smaller than the sum of its proper divisors (30168728).

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

28280656 is a wasteful number, since it uses less digits than its factorization.

28280656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 28280656 is about 5317.9559983136. The cubic root of 28280656 is about 304.6700938783.

The spelling of 28280656 in words is "twenty-eight million, two hundred eighty thousand, six hundred fifty-six".