28182139 has 4 divisors (see below), whose sum is σ = 28455856. Its totient is φ = 27908424.

The previous prime is 28182137. The next prime is 28182151. The reversal of 28182139 is 93128182.

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

It is a cyclic number.

It is not a de Polignac number, because 28182139 - 2¹ = 28182137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28182137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136704 + ... + 136909.

It is an arithmetic number, because the mean of its divisors is an integer number (7113964).

Almost surely, 2^28182139 is an apocalyptic number.

28182139 is a deficient number, since it is larger than the sum of its proper divisors (273717).

28182139 is a wasteful number, since it uses less digits than its factorization.

28182139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273716.

The product of its digits is 6912, while the sum is 34.

The square root of 28182139 is about 5308.6852421292. The cubic root of 28182139 is about 304.3159047304.

The spelling of 28182139 in words is "twenty-eight million, one hundred eighty-two thousand, one hundred thirty-nine".