28765587313 has 2 divisors, whose sum is σ = 28765587314. Its totient is φ = 28765587312.

The previous prime is 28765587271. The next prime is 28765587337. The reversal of 28765587313 is 31378556782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20318506849 + 8447080464 = 142543^2 + 91908^2 .

It is a cyclic number.

It is not a de Polignac number, because 28765587313 - 2²⁵ = 28732032881 is a prime.

It is not a weakly prime, because it can be changed into another prime (28765587013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14382793656 + 14382793657.

It is an arithmetic number, because the mean of its divisors is an integer number (14382793657).

Almost surely, 2^28765587313 is an apocalyptic number.

It is an amenable number.

28765587313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28765587313 is an equidigital number, since it uses as much as digits as its factorization.

28765587313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8467200, while the sum is 55.

The spelling of 28765587313 in words is "twenty-eight billion, seven hundred sixty-five million, five hundred eighty-seven thousand, three hundred thirteen".