28276793 has 4 divisors (see below), whose sum is σ = 28300020. Its totient is φ = 28253568.

The previous prime is 28276777. The next prime is 28276819. The reversal of 28276793 is 39767282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39767282 = 2 ⋅19883641.

It can be written as a sum of positive squares in 2 ways, for example, as 13630864 + 14645929 = 3692^2 + 3827^2 .

It is a cyclic number.

It is not a de Polignac number, because 28276793 - 2⁴ = 28276777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28276723) 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, 9680 + ... + 12257.

It is an arithmetic number, because the mean of its divisors is an integer number (7075005).

Almost surely, 2^28276793 is an apocalyptic number.

It is an amenable number.

28276793 is a deficient number, since it is larger than the sum of its proper divisors (23227).

28276793 is a wasteful number, since it uses less digits than its factorization.

28276793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23226.

The product of its digits is 254016, while the sum is 44.

The square root of 28276793 is about 5317.5927824534. The cubic root of 28276793 is about 304.6562210959.

The spelling of 28276793 in words is "twenty-eight million, two hundred seventy-six thousand, seven hundred ninety-three".