28139135 has 16 divisors (see below), whose sum is σ = 35683200. Its totient is φ = 21267456.

The previous prime is 28139123. The next prime is 28139141. The reversal of 28139135 is 53193182.

It is a cyclic number.

It is not a de Polignac number, because 28139135 - 2¹⁶ = 28073599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4751 + ... + 8879.

It is an arithmetic number, because the mean of its divisors is an integer number (2230200).

Almost surely, 2^28139135 is an apocalyptic number.

28139135 is a deficient number, since it is larger than the sum of its proper divisors (7544065).

28139135 is a wasteful number, since it uses less digits than its factorization.

28139135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4210.

The product of its digits is 6480, while the sum is 32.

The square root of 28139135 is about 5304.6333520800. The cubic root of 28139135 is about 304.1610375723.

The spelling of 28139135 in words is "twenty-eight million, one hundred thirty-nine thousand, one hundred thirty-five".