28887636 has 24 divisors (see below), whose sum is σ = 67748800. Its totient is φ = 9580032.

The previous prime is 28887623. The next prime is 28887637. The reversal of 28887636 is 63678882.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28887637) 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, 3661 + ... + 8436.

Almost surely, 2^28887636 is an apocalyptic number.

It is an amenable number.

28887636 is an abundant number, since it is smaller than the sum of its proper divisors (38861164).

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

28887636 is a wasteful number, since it uses less digits than its factorization.

28887636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12303 (or 12301 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 28887636 is about 5374.7219462964. The cubic root of 28887636 is about 306.8343668988.

The spelling of 28887636 in words is "twenty-eight million, eight hundred eighty-seven thousand, six hundred thirty-six".