28120563 has 12 divisors (see below), whose sum is σ = 40999608. Its totient is φ = 18571200.

The previous prime is 28120511. The next prime is 28120577. The reversal of 28120563 is 36502182.

28120563 is a `hidden beast` number, since 2 + 81 + 20 + 563 = 666.

It is not a de Polignac number, because 28120563 - 2¹² = 28116467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28124563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13638 + ... + 15563.

It is an arithmetic number, because the mean of its divisors is an integer number (3416634).

Almost surely, 2^28120563 is an apocalyptic number.

28120563 is a deficient number, since it is larger than the sum of its proper divisors (12879045).

28120563 is a wasteful number, since it uses less digits than its factorization.

28120563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29314 (or 29311 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28120563 is about 5302.8825180273. The cubic root of 28120563 is about 304.0941068012.

The spelling of 28120563 in words is "twenty-eight million, one hundred twenty thousand, five hundred sixty-three".