28308685 has 8 divisors (see below), whose sum is σ = 34009056. Its totient is φ = 22621200.

The previous prime is 28308667. The next prime is 28308713. The reversal of 28308685 is 58680382.

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

It is not a de Polignac number, because 28308685 - 2⁷ = 28308557 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2562 + ... + 7948.

It is an arithmetic number, because the mean of its divisors is an integer number (4251132).

Almost surely, 2^28308685 is an apocalyptic number.

It is an amenable number.

28308685 is a deficient number, since it is larger than the sum of its proper divisors (5700371).

28308685 is a wasteful number, since it uses less digits than its factorization.

28308685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6443.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28308685 is about 5320.5906626990. The cubic root of 28308685 is about 304.7707136378.

The spelling of 28308685 in words is "twenty-eight million, three hundred eight thousand, six hundred eighty-five".