28015138 has 16 divisors (see below), whose sum is σ = 42773760. Its totient is φ = 13759200.

The previous prime is 28015123. The next prime is 28015151. The reversal of 28015138 is 83151082.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44083 + ... + 44713.

It is an arithmetic number, because the mean of its divisors is an integer number (2673360).

Almost surely, 2^28015138 is an apocalyptic number.

28015138 is a deficient number, since it is larger than the sum of its proper divisors (14758622).

28015138 is a wasteful number, since it uses less digits than its factorization.

28015138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28015138 is about 5292.9328353948. The cubic root of 28015138 is about 303.7136109998.

The spelling of 28015138 in words is "twenty-eight million, fifteen thousand, one hundred thirty-eight".