28268351989 has 2 divisors, whose sum is σ = 28268351990. Its totient is φ = 28268351988.

The previous prime is 28268351987. The next prime is 28268352043. The reversal of 28268351989 is 98915386282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21243062500 + 7025289489 = 145750^2 + 83817^2 .

It is a cyclic number.

It is not a de Polignac number, because 28268351989 - 2¹ = 28268351987 is a prime.

It is a super-2 number, since 2×28268351989² (a number of 22 digits) contains 22 as substring.

Together with 28268351987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28268351983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14134175994 + 14134175995.

It is an arithmetic number, because the mean of its divisors is an integer number (14134175995).

Almost surely, 2^28268351989 is an apocalyptic number.

It is an amenable number.

28268351989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28268351989 is an equidigital number, since it uses as much as digits as its factorization.

28268351989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 61.

The spelling of 28268351989 in words is "twenty-eight billion, two hundred sixty-eight million, three hundred fifty-one thousand, nine hundred eighty-nine".