28685306 has 8 divisors (see below), whose sum is σ = 46337844. Its totient is φ = 13239360.

The previous prime is 28685299. The next prime is 28685339. The reversal of 28685306 is 60358682.

It can be written as a sum of positive squares in 2 ways, for example, as 28569025 + 116281 = 5345^2 + 341^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28685306.

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, 551615 + ... + 551666.

Almost surely, 2^28685306 is an apocalyptic number.

28685306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28685306 is a deficient number, since it is larger than the sum of its proper divisors (17652538).

28685306 is a wasteful number, since it uses less digits than its factorization.

28685306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103296.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 28685306 is about 5355.8665031907. The cubic root of 28685306 is about 306.1163283914.

The spelling of 28685306 in words is "twenty-eight million, six hundred eighty-five thousand, three hundred six".