28138675 has 12 divisors (see below), whose sum is σ = 34959816. Its totient is φ = 22467200.

The previous prime is 28138667. The next prime is 28138679. The reversal of 28138675 is 57683182.

It is not a de Polignac number, because 28138675 - 2³ = 28138667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28138679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19995 + ... + 21355.

It is an arithmetic number, because the mean of its divisors is an integer number (2913318).

Almost surely, 2^28138675 is an apocalyptic number.

28138675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28138675 is a deficient number, since it is larger than the sum of its proper divisors (6821141).

28138675 is a wasteful number, since it uses less digits than its factorization.

28138675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198 (or 2193 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 28138675 is about 5304.5899935810. The cubic root of 28138675 is about 304.1593801553.

The spelling of 28138675 in words is "twenty-eight million, one hundred thirty-eight thousand, six hundred seventy-five".