28056530 has 8 divisors (see below), whose sum is σ = 50501772. Its totient is φ = 11222608.

The previous prime is 28056517. The next prime is 28056541. The reversal of 28056530 is 3565082.

It can be written as a sum of positive squares in 2 ways, for example, as 26020201 + 2036329 = 5101^2 + 1427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28056493 and 28056502.

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 3 ways as a sum of consecutive naturals, for example, 1402817 + ... + 1402836.

Almost surely, 2^28056530 is an apocalyptic number.

28056530 is a deficient number, since it is larger than the sum of its proper divisors (22445242).

28056530 is a wasteful number, since it uses less digits than its factorization.

28056530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805660.

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

The square root of 28056530 is about 5296.8415116935. The cubic root of 28056530 is about 303.8631150233.

The spelling of 28056530 in words is "twenty-eight million, fifty-six thousand, five hundred thirty".