28317890761 has 2 divisors, whose sum is σ = 28317890762. Its totient is φ = 28317890760.

The previous prime is 28317890759. The next prime is 28317890801. The reversal of 28317890761 is 16709871382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27845263161 + 472627600 = 166869^2 + 21740^2 .

It is a cyclic number.

It is not a de Polignac number, because 28317890761 - 2¹ = 28317890759 is a prime.

Together with 28317890759, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28317890699 and 28317890708.

It is not a weakly prime, because it can be changed into another prime (28387890761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14158945380 + 14158945381.

It is an arithmetic number, because the mean of its divisors is an integer number (14158945381).

Almost surely, 2^28317890761 is an apocalyptic number.

It is an amenable number.

28317890761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28317890761 is an equidigital number, since it uses as much as digits as its factorization.

28317890761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 28317890761 in words is "twenty-eight billion, three hundred seventeen million, eight hundred ninety thousand, seven hundred sixty-one".