28305056 has 24 divisors (see below), whose sum is σ = 60013044. Its totient is φ = 13063680.

The previous prime is 28305029. The next prime is 28305061. The reversal of 28305056 is 65050382.

It can be written as a sum of positive squares in 2 ways, for example, as 27920656 + 384400 = 5284^2 + 620^2 .

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, 33605 + ... + 34436.

Almost surely, 2^28305056 is an apocalyptic number.

28305056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28305056 is an abundant number, since it is smaller than the sum of its proper divisors (31707988).

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

28305056 is a wasteful number, since it uses less digits than its factorization.

28305056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68064 (or 68056 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 28305056 is about 5320.2496182040. The cubic root of 28305056 is about 304.7576898351.

The spelling of 28305056 in words is "twenty-eight million, three hundred five thousand, fifty-six".