28365111866 has 48 divisors (see below), whose sum is σ = 53327795976. Its totient is φ = 11215822464.

The previous prime is 28365111851. The next prime is 28365111869. The reversal of 28365111866 is 66811156382.

It can be written as a sum of positive squares in 4 ways, for example, as 19704017641 + 8661094225 = 140371^2 + 93065^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28365111866.

It is not an unprimeable number, because it can be changed into a prime (28365111869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3406340 + ... + 3414656.

Almost surely, 2^28365111866 is an apocalyptic number.

28365111866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28365111866 is a deficient number, since it is larger than the sum of its proper divisors (24962684110).

28365111866 is a wasteful number, since it uses less digits than its factorization.

28365111866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11023 (or 11016 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The spelling of 28365111866 in words is "twenty-eight billion, three hundred sixty-five million, one hundred eleven thousand, eight hundred sixty-six".