28368288961 has 2 divisors, whose sum is σ = 28368288962. Its totient is φ = 28368288960.

The previous prime is 28368288959. The next prime is 28368288989. The reversal of 28368288961 is 16988286382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16629649936 + 11738639025 = 128956^2 + 108345^2 .

It is a cyclic number.

It is not a de Polignac number, because 28368288961 - 2¹ = 28368288959 is a prime.

Together with 28368288959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28368288961.

It is not a weakly prime, because it can be changed into another prime (28368288901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14184144480 + 14184144481.

It is an arithmetic number, because the mean of its divisors is an integer number (14184144481).

Almost surely, 2^28368288961 is an apocalyptic number.

It is an amenable number.

28368288961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28368288961 is an equidigital number, since it uses as much as digits as its factorization.

28368288961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15925248, while the sum is 61.

The spelling of 28368288961 in words is "twenty-eight billion, three hundred sixty-eight million, two hundred eighty-eight thousand, nine hundred sixty-one".