28289685 has 8 divisors (see below), whose sum is σ = 45263520. Its totient is φ = 15087824.

The previous prime is 28289669. The next prime is 28289687. The reversal of 28289685 is 58698282.

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

It is a cyclic number.

It is not a de Polignac number, because 28289685 - 2⁴ = 28289669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28289687) 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, 942975 + ... + 943004.

It is an arithmetic number, because the mean of its divisors is an integer number (5657940).

Almost surely, 2^28289685 is an apocalyptic number.

It is an amenable number.

28289685 is a deficient number, since it is larger than the sum of its proper divisors (16973835).

28289685 is a wasteful number, since it uses less digits than its factorization.

28289685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885987.

The product of its digits is 552960, while the sum is 48.

The square root of 28289685 is about 5318.8048469558. The cubic root of 28289685 is about 304.7025138427.

The spelling of 28289685 in words is "twenty-eight million, two hundred eighty-nine thousand, six hundred eighty-five".