28317686 has 4 divisors (see below), whose sum is σ = 42476532. Its totient is φ = 14158842.

The previous prime is 28317683. The next prime is 28317697. The reversal of 28317686 is 68671382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28317683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7079420 + ... + 7079423.

It is an arithmetic number, because the mean of its divisors is an integer number (10619133).

Almost surely, 2^28317686 is an apocalyptic number.

28317686 is a deficient number, since it is larger than the sum of its proper divisors (14158846).

28317686 is a wasteful number, since it uses less digits than its factorization.

28317686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14158845.

The product of its digits is 96768, while the sum is 41.

The square root of 28317686 is about 5321.4364602051. The cubic root of 28317686 is about 304.8030117411.

The spelling of 28317686 in words is "twenty-eight million, three hundred seventeen thousand, six hundred eighty-six".