28518138 has 24 divisors (see below), whose sum is σ = 67406976. Its totient is φ = 8641800.

The previous prime is 28518121. The next prime is 28518167. The reversal of 28518138 is 83181582.

28518138 is a `hidden beast` number, since 2 + 8 + 518 + 138 = 666.

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, 71818 + ... + 72213.

It is an arithmetic number, because the mean of its divisors is an integer number (2808624).

Almost surely, 2^28518138 is an apocalyptic number.

28518138 is an abundant number, since it is smaller than the sum of its proper divisors (38888838).

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

28518138 is a wasteful number, since it uses less digits than its factorization.

28518138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144050 (or 144047 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 28518138 is about 5340.2376351619. The cubic root of 28518138 is about 305.5205229600.

The spelling of 28518138 in words is "twenty-eight million, five hundred eighteen thousand, one hundred thirty-eight".