28243420669 has 2 divisors, whose sum is σ = 28243420670. Its totient is φ = 28243420668.

The previous prime is 28243420651. The next prime is 28243420741. The reversal of 28243420669 is 96602434282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15078612025 + 13164808644 = 122795^2 + 114738^2 .

It is a cyclic number.

It is not a de Polignac number, because 28243420669 - 2⁹ = 28243420157 is a prime.

It is a super-2 number, since 2×28243420669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28243424669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121710334 + 14121710335.

It is an arithmetic number, because the mean of its divisors is an integer number (14121710335).

Almost surely, 2^28243420669 is an apocalyptic number.

It is an amenable number.

28243420669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28243420669 is an equidigital number, since it uses as much as digits as its factorization.

28243420669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 46.

The spelling of 28243420669 in words is "twenty-eight billion, two hundred forty-three million, four hundred twenty thousand, six hundred sixty-nine".