28140158 has 4 divisors (see below), whose sum is σ = 42210240. Its totient is φ = 14070078.

The previous prime is 28140143. The next prime is 28140187. The reversal of 28140158 is 85104182.

28140158 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28140158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7035038 + ... + 7035041.

It is an arithmetic number, because the mean of its divisors is an integer number (10552560).

Almost surely, 2^28140158 is an apocalyptic number.

28140158 is a deficient number, since it is larger than the sum of its proper divisors (14070082).

28140158 is a wasteful number, since it uses less digits than its factorization.

28140158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14070081.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 28140158 is about 5304.7297763411. The cubic root of 28140158 is about 304.1647234587.

The spelling of 28140158 in words is "twenty-eight million, one hundred forty thousand, one hundred fifty-eight".