28236813797 has 2 divisors, whose sum is σ = 28236813798. Its totient is φ = 28236813796.

The previous prime is 28236813701. The next prime is 28236813823. The reversal of 28236813797 is 79731863282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27927088996 + 309724801 = 167114^2 + 17599^2 .

It is a cyclic number.

It is not a de Polignac number, because 28236813797 - 2³² = 23941846501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28236843797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14118406898 + 14118406899.

It is an arithmetic number, because the mean of its divisors is an integer number (14118406899).

Almost surely, 2^28236813797 is an apocalyptic number.

It is an amenable number.

28236813797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28236813797 is an equidigital number, since it uses as much as digits as its factorization.

28236813797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 56.

The spelling of 28236813797 in words is "twenty-eight billion, two hundred thirty-six million, eight hundred thirteen thousand, seven hundred ninety-seven".