28639168 has 28 divisors (see below), whose sum is σ = 58046112. Its totient is φ = 14013440.

The previous prime is 28639157. The next prime is 28639207. The reversal of 28639168 is 86193682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1753 + ... + 7768.

Almost surely, 2^28639168 is an apocalyptic number.

It is an amenable number.

28639168 is an abundant number, since it is smaller than the sum of its proper divisors (29406944).

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

28639168 is an equidigital number, since it uses as much as digits as its factorization.

28639168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9580 (or 9570 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 28639168 is about 5351.5575302897. The cubic root of 28639168 is about 305.9521191832.

The spelling of 28639168 in words is "twenty-eight million, six hundred thirty-nine thousand, one hundred sixty-eight".