28693686 has 64 divisors (see below), whose sum is σ = 70801920. Its totient is φ = 7568640.

The previous prime is 28693663. The next prime is 28693741. The reversal of 28693686 is 68639682.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32280 + ... + 33156.

It is an arithmetic number, because the mean of its divisors is an integer number (1106280).

Almost surely, 2^28693686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28693686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35400960).

28693686 is an abundant number, since it is smaller than the sum of its proper divisors (42108234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28693686 is a wasteful number, since it uses less digits than its factorization.

28693686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949.

The product of its digits is 746496, while the sum is 48.

The square root of 28693686 is about 5356.6487657863. The cubic root of 28693686 is about 306.1461346515.

It can be divided in two parts, 2869 and 3686, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 28693686 in words is "twenty-eight million, six hundred ninety-three thousand, six hundred eighty-six".