28136807 has 2 divisors, whose sum is σ = 28136808. Its totient is φ = 28136806.

The previous prime is 28136743. The next prime is 28136813. The reversal of 28136807 is 70863182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28136807 - 2⁶ = 28136743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28136837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14068403 + 14068404.

It is an arithmetic number, because the mean of its divisors is an integer number (14068404).

Almost surely, 2^28136807 is an apocalyptic number.

28136807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28136807 is an equidigital number, since it uses as much as digits as its factorization.

28136807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28136807 is about 5304.4139167301. The cubic root of 28136807 is about 304.1526494155.

Adding to 28136807 its reverse (70863182), we get a palindrome (98999989).

The spelling of 28136807 in words is "twenty-eight million, one hundred thirty-six thousand, eight hundred seven".