28567766866 has 8 divisors (see below), whose sum is σ = 42853834620. Its totient is φ = 14283155328.

The previous prime is 28567766849. The next prime is 28567766873. The reversal of 28567766866 is 66866776582.

28567766866 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 27170577225 + 1397189641 = 164835^2 + 37379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28567766866² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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, 313611 + ... + 394318.

Almost surely, 2^28567766866 is an apocalyptic number.

28567766866 is a deficient number, since it is larger than the sum of its proper divisors (14286067754).

28567766866 is a wasteful number, since it uses less digits than its factorization.

28567766866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728108.

The product of its digits is 243855360, while the sum is 67.

The spelling of 28567766866 in words is "twenty-eight billion, five hundred sixty-seven million, seven hundred sixty-six thousand, eight hundred sixty-six".