28118394 has 32 divisors (see below), whose sum is σ = 62856000. Its totient is φ = 9317232.

The previous prime is 28118383. The next prime is 28118399. The reversal of 28118394 is 49381182.

It is a super-2 number, since 2×28118394² = 1581288162278472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28118399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8212 + ... + 11120.

It is an arithmetic number, because the mean of its divisors is an integer number (1964250).

Almost surely, 2^28118394 is an apocalyptic number.

28118394 is an abundant number, since it is smaller than the sum of its proper divisors (34737606).

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

28118394 is a wasteful number, since it uses less digits than its factorization.

28118394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099 (or 3093 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 28118394 is about 5302.6780026700. The cubic root of 28118394 is about 304.0862881209.

The spelling of 28118394 in words is "twenty-eight million, one hundred eighteen thousand, three hundred ninety-four".