28680138 has 12 divisors (see below), whose sum is σ = 62140338. Its totient is φ = 9560040.

The previous prime is 28680137. The next prime is 28680163. The reversal of 28680138 is 83108682.

It can be written as a sum of positive squares in only one way, i.e., 23357889 + 5322249 = 4833^2 + 2307^2 .

It is not an unprimeable number, because it can be changed into a prime (28680133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 796653 + ... + 796688.

Almost surely, 2^28680138 is an apocalyptic number.

28680138 is an abundant number, since it is smaller than the sum of its proper divisors (33460200).

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

28680138 is a wasteful number, since it uses less digits than its factorization.

28680138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593349 (or 1593346 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28680138 is about 5355.3840198440. The cubic root of 28680138 is about 306.0979437848.

The spelling of 28680138 in words is "twenty-eight million, six hundred eighty thousand, one hundred thirty-eight".