28134505 has 16 divisors (see below), whose sum is σ = 38674944. Its totient is φ = 19247040.

The previous prime is 28134503. The next prime is 28134511. The reversal of 28134505 is 50543182.

It is not a de Polignac number, because 28134505 - 2¹ = 28134503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28134503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22240 + ... + 23470.

It is an arithmetic number, because the mean of its divisors is an integer number (2417184).

Almost surely, 2^28134505 is an apocalyptic number.

It is an amenable number.

28134505 is a deficient number, since it is larger than the sum of its proper divisors (10540439).

28134505 is a wasteful number, since it uses less digits than its factorization.

28134505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 28134505 is about 5304.1969231920. The cubic root of 28134505 is about 304.1443544860.

Adding to 28134505 its reverse (50543182), we get a palindrome (78677687).

It can be divided in two parts, 28 and 134505, that multiplied together give a triangular number (3766140 = T₂₇₄₄).

The spelling of 28134505 in words is "twenty-eight million, one hundred thirty-four thousand, five hundred five".