28685613 has 16 divisors (see below), whose sum is σ = 44179776. Its totient is φ = 16362240.

The previous prime is 28685599. The next prime is 28685653. The reversal of 28685613 is 31658682.

It is a happy number.

It is not a de Polignac number, because 28685613 - 2⁴ = 28685597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28685653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25006 + ... + 26127.

It is an arithmetic number, because the mean of its divisors is an integer number (2761236).

Almost surely, 2^28685613 is an apocalyptic number.

It is an amenable number.

28685613 is a deficient number, since it is larger than the sum of its proper divisors (15494163).

28685613 is a wasteful number, since it uses less digits than its factorization.

28685613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51164.

The product of its digits is 69120, while the sum is 39.

The square root of 28685613 is about 5355.8951632757. The cubic root of 28685613 is about 306.1174204416.

The spelling of 28685613 in words is "twenty-eight million, six hundred eighty-five thousand, six hundred thirteen".