28830138 has 16 divisors (see below), whose sum is σ = 57731520. Its totient is φ = 9598176.

The previous prime is 28830121. The next prime is 28830149. The reversal of 28830138 is 83103882.

It is a junction number, because it is equal to n+sod(n) for n = 28830099 and 28830108.

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, 3318 + ... + 8286.

It is an arithmetic number, because the mean of its divisors is an integer number (3608220).

Almost surely, 2^28830138 is an apocalyptic number.

28830138 is an abundant number, since it is smaller than the sum of its proper divisors (28901382).

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

28830138 is a wasteful number, since it uses less digits than its factorization.

28830138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5941.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28830138 is about 5369.3703541477. The cubic root of 28830138 is about 306.6306571350.

The spelling of 28830138 in words is "twenty-eight million, eight hundred thirty thousand, one hundred thirty-eight".