28056580 has 12 divisors (see below), whose sum is σ = 58918860. Its totient is φ = 11222624.

The previous prime is 28056569. The next prime is 28056583. The reversal of 28056580 is 8565082.

It can be written as a sum of positive squares in 2 ways, for example, as 8573184 + 19483396 = 2928^2 + 4414^2 .

It is not an unprimeable number, because it can be changed into a prime (28056583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701395 + ... + 701434.

It is an arithmetic number, because the mean of its divisors is an integer number (4909905).

Almost surely, 2^28056580 is an apocalyptic number.

28056580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28056580 is an abundant number, since it is smaller than the sum of its proper divisors (30862280).

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

28056580 is a wasteful number, since it uses less digits than its factorization.

28056580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402838 (or 1402836 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 28056580 is about 5296.8462314853. The cubic root of 28056580 is about 303.8632955296.

The spelling of 28056580 in words is "twenty-eight million, fifty-six thousand, five hundred eighty".