28969565 has 4 divisors (see below), whose sum is σ = 34763484. Its totient is φ = 23175648.

The previous prime is 28969553. The next prime is 28969583. The reversal of 28969565 is 56596982.

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 3678724 + 25290841 = 1918^2 + 5029^2 .

It is a cyclic number.

It is not a de Polignac number, because 28969565 - 2¹⁴ = 28953181 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2896952 + ... + 2896961.

It is an arithmetic number, because the mean of its divisors is an integer number (8690871).

Almost surely, 2^28969565 is an apocalyptic number.

It is an amenable number.

28969565 is a deficient number, since it is larger than the sum of its proper divisors (5793919).

28969565 is an equidigital number, since it uses as much as digits as its factorization.

28969565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793918.

The product of its digits is 1166400, while the sum is 50.

The square root of 28969565 is about 5382.3382465245. The cubic root of 28969565 is about 307.1241668299.

The spelling of 28969565 in words is "twenty-eight million, nine hundred sixty-nine thousand, five hundred sixty-five".