28684786 has 16 divisors (see below), whose sum is σ = 46680984. Its totient is φ = 13140864.

The previous prime is 28684783. The next prime is 28684801. The reversal of 28684786 is 68748682.

It can be written as a sum of positive squares in 4 ways, for example, as 24354225 + 4330561 = 4935^2 + 2081^2 .

It is not an unprimeable number, because it can be changed into a prime (28684783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465 + ... + 7588.

Almost surely, 2^28684786 is an apocalyptic number.

28684786 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28684786 is a deficient number, since it is larger than the sum of its proper divisors (17996198).

28684786 is a wasteful number, since it uses less digits than its factorization.

28684786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8205.

The product of its digits is 1032192, while the sum is 49.

The square root of 28684786 is about 5355.8179580714. The cubic root of 28684786 is about 306.1144786470.

The spelling of 28684786 in words is "twenty-eight million, six hundred eighty-four thousand, seven hundred eighty-six".