28142115 has 16 divisors (see below), whose sum is σ = 45792000. Its totient is φ = 14754272.

The previous prime is 28142111. The next prime is 28142117. The reversal of 28142115 is 51124182.

It is a cyclic number.

It is not a de Polignac number, because 28142115 - 2² = 28142111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28142111) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15015 + ... + 16784.

It is an arithmetic number, because the mean of its divisors is an integer number (2862000).

Almost surely, 2^28142115 is an apocalyptic number.

28142115 is a deficient number, since it is larger than the sum of its proper divisors (17649885).

28142115 is a wasteful number, since it uses less digits than its factorization.

28142115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31866.

The product of its digits is 640, while the sum is 24.

The square root of 28142115 is about 5304.9142311634. The cubic root of 28142115 is about 304.1717743143.

Adding to 28142115 its reverse (51124182), we get a palindrome (79266297).

The spelling of 28142115 in words is "twenty-eight million, one hundred forty-two thousand, one hundred fifteen".