28276638 has 16 divisors (see below), whose sum is σ = 60903696. Its totient is φ = 8700480.

The previous prime is 28276609. The next prime is 28276639. The reversal of 28276638 is 83667282.

It is a self number, because there is not a number n which added to its sum of digits gives 28276638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28276639) 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, 181183 + ... + 181338.

It is an arithmetic number, because the mean of its divisors is an integer number (3806481).

Almost surely, 2^28276638 is an apocalyptic number.

28276638 is an abundant number, since it is smaller than the sum of its proper divisors (32627058).

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

28276638 is a wasteful number, since it uses less digits than its factorization.

28276638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362539.

The product of its digits is 193536, while the sum is 42.

The square root of 28276638 is about 5317.5782081696. The cubic root of 28276638 is about 304.6556644344.

The spelling of 28276638 in words is "twenty-eight million, two hundred seventy-six thousand, six hundred thirty-eight".