28685936 has 40 divisors (see below), whose sum is σ = 59219424. Its totient is φ = 13414400.

The previous prime is 28685929. The next prime is 28685939. The reversal of 28685936 is 63958682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28685939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71336 + ... + 71736.

Almost surely, 2^28685936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28685936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29609712).

28685936 is an abundant number, since it is smaller than the sum of its proper divisors (30533488).

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

28685936 is a wasteful number, since it uses less digits than its factorization.

28685936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 683 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 28685936 is about 5355.9253168804. The cubic root of 28685936 is about 306.1185693980.

The spelling of 28685936 in words is "twenty-eight million, six hundred eighty-five thousand, nine hundred thirty-six".