28714561 has 4 divisors (see below), whose sum is σ = 28730052. Its totient is φ = 28699072.

The previous prime is 28714559. The next prime is 28714571. The reversal of 28714561 is 16541782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4704561 + 24010000 = 2169^2 + 4900^2 .

It is a cyclic number.

It is not a de Polignac number, because 28714561 - 2¹ = 28714559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28714531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4516 + ... + 8821.

It is an arithmetic number, because the mean of its divisors is an integer number (7182513).

Almost surely, 2^28714561 is an apocalyptic number.

It is an amenable number.

28714561 is a deficient number, since it is larger than the sum of its proper divisors (15491).

28714561 is a wasteful number, since it uses less digits than its factorization.

28714561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15490.

The product of its digits is 13440, while the sum is 34.

The square root of 28714561 is about 5358.5969245690. The cubic root of 28714561 is about 306.2203583139.

The spelling of 28714561 in words is "twenty-eight million, seven hundred fourteen thousand, five hundred sixty-one".