28268388 has 36 divisors (see below), whose sum is σ = 73922940. Its totient is φ = 9097536.

The previous prime is 28268381. The next prime is 28268411. The reversal of 28268388 is 88386282.

28268388 is a `hidden beast` number, since 2 + 8 + 268 + 388 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19554084 + 8714304 = 4422^2 + 2952^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28268381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12495 + ... + 14582.

It is an arithmetic number, because the mean of its divisors is an integer number (2053415).

Almost surely, 2^28268388 is an apocalyptic number.

It is an amenable number.

28268388 is an abundant number, since it is smaller than the sum of its proper divisors (45654552).

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

28268388 is a wasteful number, since it uses less digits than its factorization.

28268388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27116 (or 27111 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 28268388 is about 5316.8024225092. The cubic root of 28268388 is about 304.6260327445.

The spelling of 28268388 in words is "twenty-eight million, two hundred sixty-eight thousand, three hundred eighty-eight".