28140155 has 12 divisors (see below), whose sum is σ = 35303520. Its totient is φ = 21531312.

The previous prime is 28140143. The next prime is 28140187. The reversal of 28140155 is 55104182.

It is not a de Polignac number, because 28140155 - 2⁴ = 28140139 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2675 + ... + 7964.

It is an arithmetic number, because the mean of its divisors is an integer number (2941960).

Almost surely, 2^28140155 is an apocalyptic number.

28140155 is a deficient number, since it is larger than the sum of its proper divisors (7163365).

28140155 is a wasteful number, since it uses less digits than its factorization.

28140155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10690 (or 10667 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 28140155 is about 5304.7294935746. The cubic root of 28140155 is about 304.1647126498.

The spelling of 28140155 in words is "twenty-eight million, one hundred forty thousand, one hundred fifty-five".