28365685786 has 4 divisors (see below), whose sum is σ = 42548528682. Its totient is φ = 14182842892.

The previous prime is 28365685783. The next prime is 28365685787. The reversal of 28365685786 is 68758656382.

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

It can be written as a sum of positive squares in only one way, i.e., 27817236225 + 548449561 = 166785^2 + 23419^2 .

It is a super-2 number, since 2×28365685786² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28365685783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7091421445 + ... + 7091421448.

Almost surely, 2^28365685786 is an apocalyptic number.

28365685786 is a deficient number, since it is larger than the sum of its proper divisors (14182842896).

28365685786 is a wasteful number, since it uses less digits than its factorization.

28365685786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14182842895.

The product of its digits is 116121600, while the sum is 64.

The spelling of 28365685786 in words is "twenty-eight billion, three hundred sixty-five million, six hundred eighty-five thousand, seven hundred eighty-six".