28767412565 has 4 divisors (see below), whose sum is σ = 34520895084. Its totient is φ = 23013930048.

The previous prime is 28767412549. The next prime is 28767412573. The reversal of 28767412565 is 56521476782.

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 12363438481 + 16403974084 = 111191^2 + 128078^2 .

It is a cyclic number.

It is not a de Polignac number, because 28767412565 - 2⁴ = 28767412549 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2876741252 + ... + 2876741261.

It is an arithmetic number, because the mean of its divisors is an integer number (8630223771).

Almost surely, 2^28767412565 is an apocalyptic number.

It is an amenable number.

28767412565 is a deficient number, since it is larger than the sum of its proper divisors (5753482519).

28767412565 is an equidigital number, since it uses as much as digits as its factorization.

28767412565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753482518.

The product of its digits is 5644800, while the sum is 53.

The spelling of 28767412565 in words is "twenty-eight billion, seven hundred sixty-seven million, four hundred twelve thousand, five hundred sixty-five".