28993365169 has 2 divisors, whose sum is σ = 28993365170. Its totient is φ = 28993365168.

The previous prime is 28993365151. The next prime is 28993365221. The reversal of 28993365169 is 96156339982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17087718400 + 11905646769 = 130720^2 + 109113^2 .

It is a cyclic number.

It is not a de Polignac number, because 28993365169 - 2²¹ = 28991268017 is a prime.

It is a super-2 number, since 2×28993365169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28993365469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14496682584 + 14496682585.

It is an arithmetic number, because the mean of its divisors is an integer number (14496682585).

Almost surely, 2^28993365169 is an apocalyptic number.

It is an amenable number.

28993365169 is a deficient number, since it is larger than the sum of its proper divisors (1).

28993365169 is an equidigital number, since it uses as much as digits as its factorization.

28993365169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 61.

The spelling of 28993365169 in words is "twenty-eight billion, nine hundred ninety-three million, three hundred sixty-five thousand, one hundred sixty-nine".