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28135139 = 79356141
BaseRepresentation
bin110101101010…
…0111011100011
31221221102011012
41223110323203
524200311024
62443011135
7461100434
oct153247343
957842135
1028135139
111497738a
129509aab
135aa1216
143a4548b
15270b50e
hex1ad4ee3

28135139 has 4 divisors (see below), whose sum is σ = 28491360. Its totient is φ = 27778920.

The previous prime is 28135111. The next prime is 28135147. The reversal of 28135139 is 93153182.

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 28135139 - 216 = 28069603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28135339) 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, 177992 + ... + 178149.

It is an arithmetic number, because the mean of its divisors is an integer number (7122840).

Almost surely, 228135139 is an apocalyptic number.

28135139 is a deficient number, since it is larger than the sum of its proper divisors (356221).

28135139 is an equidigital number, since it uses as much as digits as its factorization.

28135139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356220.

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

The square root of 28135139 is about 5304.2566868507. The cubic root of 28135139 is about 304.1466390600.

The spelling of 28135139 in words is "twenty-eight million, one hundred thirty-five thousand, one hundred thirty-nine".

Divisors: 1 79 356141 28135139