28336638 has 64 divisors (see below), whose sum is σ = 66355200. Its totient is φ = 7976160.

The previous prime is 28336631. The next prime is 28336681. The reversal of 28336638 is 83663382.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28336596 and 28336605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28336631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73795 + ... + 74177.

It is an arithmetic number, because the mean of its divisors is an integer number (1036800).

Almost surely, 2^28336638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28336638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33177600).

28336638 is an abundant number, since it is smaller than the sum of its proper divisors (38018562).

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

28336638 is a wasteful number, since it uses less digits than its factorization.

28336638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477.

The product of its digits is 124416, while the sum is 39.

The square root of 28336638 is about 5323.2168845539. The cubic root of 28336638 is about 304.8709944435.

The spelling of 28336638 in words is "twenty-eight million, three hundred thirty-six thousand, six hundred thirty-eight".