28252138 has 16 divisors (see below), whose sum is σ = 43217280. Its totient is φ = 13849056.

The previous prime is 28252117. The next prime is 28252151. The reversal of 28252138 is 83125282.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25206 + ... + 26302.

It is an arithmetic number, because the mean of its divisors is an integer number (2701080).

Almost surely, 2^28252138 is an apocalyptic number.

28252138 is a deficient number, since it is larger than the sum of its proper divisors (14965142).

28252138 is a wasteful number, since it uses less digits than its factorization.

28252138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341.

The product of its digits is 7680, while the sum is 31.

The square root of 28252138 is about 5315.2740286838. The cubic root of 28252138 is about 304.5676504287.

The spelling of 28252138 in words is "twenty-eight million, two hundred fifty-two thousand, one hundred thirty-eight".