28564785651 has 4 divisors (see below), whose sum is σ = 38086380872. Its totient is φ = 19043190432.

The previous prime is 28564785647. The next prime is 28564785671. The reversal of 28564785651 is 15658746582.

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

It is not a de Polignac number, because 28564785651 - 2² = 28564785647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28564785591 and 28564785600.

It is not an unprimeable number, because it can be changed into a prime (28564785671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4760797606 + ... + 4760797611.

It is an arithmetic number, because the mean of its divisors is an integer number (9521595218).

Almost surely, 2^28564785651 is an apocalyptic number.

28564785651 is a deficient number, since it is larger than the sum of its proper divisors (9521595221).

28564785651 is an equidigital number, since it uses as much as digits as its factorization.

28564785651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9521595220.

The product of its digits is 16128000, while the sum is 57.

The spelling of 28564785651 in words is "twenty-eight billion, five hundred sixty-four million, seven hundred eighty-five thousand, six hundred fifty-one".