28136139 has 8 divisors (see below), whose sum is σ = 39721680. Its totient is φ = 17654016.

The previous prime is 28136137. The next prime is 28136149. The reversal of 28136139 is 93163182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28136139 - 2¹ = 28136137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28136137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275794 + ... + 275895.

It is an arithmetic number, because the mean of its divisors is an integer number (4965210).

Almost surely, 2^28136139 is an apocalyptic number.

28136139 is a deficient number, since it is larger than the sum of its proper divisors (11585541).

28136139 is a wasteful number, since it uses less digits than its factorization.

28136139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551709.

The product of its digits is 7776, while the sum is 33.

The square root of 28136139 is about 5304.3509499278. The cubic root of 28136139 is about 304.1502424192.

The spelling of 28136139 in words is "twenty-eight million, one hundred thirty-six thousand, one hundred thirty-nine".