28938818 has 4 divisors (see below), whose sum is σ = 43408230. Its totient is φ = 14469408.

The previous prime is 28938809. The next prime is 28938829. The reversal of 28938818 is 81883982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19123129 + 9815689 = 4373^2 + 3133^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7234703 + ... + 7234706.

Almost surely, 2^28938818 is an apocalyptic number.

28938818 is a deficient number, since it is larger than the sum of its proper divisors (14469412).

28938818 is a wasteful number, since it uses less digits than its factorization.

28938818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14469411.

The product of its digits is 221184, while the sum is 47.

The square root of 28938818 is about 5379.4812017517. The cubic root of 28938818 is about 307.0154724171.

It can be divided in two parts, 2893 and 8818, that added together give a palindrome (11711).

The spelling of 28938818 in words is "twenty-eight million, nine hundred thirty-eight thousand, eight hundred eighteen".