28669567937 has 4 divisors (see below), whose sum is σ = 29139560916. Its totient is φ = 28199574960.

The previous prime is 28669567897. The next prime is 28669567957. The reversal of 28669567937 is 73976596682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73976596682 = 2 ⋅36988298341.

It can be written as a sum of positive squares in 2 ways, for example, as 2206086961 + 26463480976 = 46969^2 + 162676^2 .

It is a cyclic number.

It is not a de Polignac number, because 28669567937 - 2²⁰ = 28668519361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28669567957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234996398 + ... + 234996519.

It is an arithmetic number, because the mean of its divisors is an integer number (7284890229).

Almost surely, 2^28669567937 is an apocalyptic number.

It is an amenable number.

28669567937 is a deficient number, since it is larger than the sum of its proper divisors (469992979).

28669567937 is an equidigital number, since it uses as much as digits as its factorization.

28669567937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469992978.

The product of its digits is 205752960, while the sum is 68.

The spelling of 28669567937 in words is "twenty-eight billion, six hundred sixty-nine million, five hundred sixty-seven thousand, nine hundred thirty-seven".