28638318 has 8 divisors (see below), whose sum is σ = 57276648. Its totient is φ = 9546104.

The previous prime is 28638317. The next prime is 28638359. The reversal of 28638318 is 81383682.

It is a sphenic number, since it is the product of 3 distinct primes.

28638318 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2386521 + ... + 2386532.

It is an arithmetic number, because the mean of its divisors is an integer number (7159581).

Almost surely, 2^28638318 is an apocalyptic number.

28638318 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28638318 is a wasteful number, since it uses less digits than its factorization.

28638318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773058.

The product of its digits is 55296, while the sum is 39.

The square root of 28638318 is about 5351.4781135683. The cubic root of 28638318 is about 305.9490923044.

The spelling of 28638318 in words is "twenty-eight million, six hundred thirty-eight thousand, three hundred eighteen".