28013685 has 16 divisors (see below), whose sum is σ = 51225216. Its totient is φ = 12806208.

The previous prime is 28013653. The next prime is 28013693. The reversal of 28013685 is 58631082.

It is a happy number.

It is not a de Polignac number, because 28013685 - 2⁵ = 28013653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133294 + ... + 133503.

It is an arithmetic number, because the mean of its divisors is an integer number (3201576).

Almost surely, 2^28013685 is an apocalyptic number.

It is an amenable number.

28013685 is a deficient number, since it is larger than the sum of its proper divisors (23211531).

28013685 is a wasteful number, since it uses less digits than its factorization.

28013685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266812.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28013685 is about 5292.7955751191. The cubic root of 28013685 is about 303.7083602254.

The spelling of 28013685 in words is "twenty-eight million, thirteen thousand, six hundred eighty-five".