28686500 has 24 divisors (see below), whose sum is σ = 62652408. Its totient is φ = 11474400.

The previous prime is 28686499. The next prime is 28686517. The reversal of 28686500 is 568682.

It can be written as a sum of positive squares in 4 ways, for example, as 128164 + 28558336 = 358^2 + 5344^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28187 + ... + 29186.

It is an arithmetic number, because the mean of its divisors is an integer number (2610517).

Almost surely, 2^28686500 is an apocalyptic number.

28686500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28686500 is an abundant number, since it is smaller than the sum of its proper divisors (33965908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28686500 is a wasteful number, since it uses less digits than its factorization.

28686500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57392 (or 57380 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 28686500 is about 5355.9779685880. The cubic root of 28686500 is about 306.1205756046.

The spelling of 28686500 in words is "twenty-eight million, six hundred eighty-six thousand, five hundred".