28917685 has 8 divisors (see below), whose sum is σ = 34876800. Its totient is φ = 23017104.

The previous prime is 28917671. The next prime is 28917703. The reversal of 28917685 is 58671982.

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 28917685 - 2⁵ = 28917653 is a prime.

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, 13537 + ... + 15526.

It is an arithmetic number, because the mean of its divisors is an integer number (4359600).

Almost surely, 2^28917685 is an apocalyptic number.

It is an amenable number.

28917685 is a deficient number, since it is larger than the sum of its proper divisors (5959115).

28917685 is a wasteful number, since it uses less digits than its factorization.

28917685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29267.

The product of its digits is 241920, while the sum is 46.

The square root of 28917685 is about 5377.5166201510. The cubic root of 28917685 is about 306.9407200208.

The spelling of 28917685 in words is "twenty-eight million, nine hundred seventeen thousand, six hundred eighty-five".