28534561 has 16 divisors (see below), whose sum is σ = 32947200. Its totient is φ = 24440400.

The previous prime is 28534549. The next prime is 28534573. The reversal of 28534561 is 16543582.

It is an interprime number because it is at equal distance from previous prime (28534549) and next prime (28534573).

It is a cyclic number.

It is not a de Polignac number, because 28534561 - 2¹⁷ = 28403489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28534501) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 64780 + ... + 65218.

It is an arithmetic number, because the mean of its divisors is an integer number (2059200).

Almost surely, 2^28534561 is an apocalyptic number.

It is an amenable number.

28534561 is a deficient number, since it is larger than the sum of its proper divisors (4412639).

28534561 is a wasteful number, since it uses less digits than its factorization.

28534561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its digits is 28800, while the sum is 34.

The square root of 28534561 is about 5341.7750795031. The cubic root of 28534561 is about 305.5791593348.

The spelling of 28534561 in words is "twenty-eight million, five hundred thirty-four thousand, five hundred sixty-one".