28818138 has 16 divisors (see below), whose sum is σ = 57691296. Its totient is φ = 9596880.

The previous prime is 28818113. The next prime is 28818151. The reversal of 28818138 is 83181882.

It is a junction number, because it is equal to n+sod(n) for n = 28818096 and 28818105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8245 + ... + 11207.

It is an arithmetic number, because the mean of its divisors is an integer number (3605706).

Almost surely, 2^28818138 is an apocalyptic number.

28818138 is an abundant number, since it is smaller than the sum of its proper divisors (28873158).

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

28818138 is a wasteful number, since it uses less digits than its factorization.

28818138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4589.

The product of its digits is 24576, while the sum is 39.

The square root of 28818138 is about 5368.2527883847. The cubic root of 28818138 is about 306.5881081593.

The spelling of 28818138 in words is "twenty-eight million, eight hundred eighteen thousand, one hundred thirty-eight".