28381338 has 24 divisors (see below), whose sum is σ = 61600500. Its totient is φ = 9443904.

The previous prime is 28381321. The next prime is 28381349. The reversal of 28381338 is 83318382.

It can be written as a sum of positive squares in 2 ways, for example, as 24472809 + 3908529 = 4947^2 + 1977^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13588 + ... + 15536.

Almost surely, 2^28381338 is an apocalyptic number.

28381338 is an abundant number, since it is smaller than the sum of its proper divisors (33219162).

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

28381338 is a wasteful number, since it uses less digits than its factorization.

28381338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766 (or 2763 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28381338 is about 5327.4138191059. The cubic root of 28381338 is about 305.0312178026.

The spelling of 28381338 in words is "twenty-eight million, three hundred eighty-one thousand, three hundred thirty-eight".