28015815089 has 2 divisors, whose sum is σ = 28015815090. Its totient is φ = 28015815088.

The previous prime is 28015815011. The next prime is 28015815119. The reversal of 28015815089 is 98051851082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17640355489 + 10375459600 = 132817^2 + 101860^2 .

It is a cyclic number.

It is not a de Polignac number, because 28015815089 - 2²⁰ = 28014766513 is a prime.

It is not a weakly prime, because it can be changed into another prime (28015815589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14007907544 + 14007907545.

It is an arithmetic number, because the mean of its divisors is an integer number (14007907545).

Almost surely, 2^28015815089 is an apocalyptic number.

It is an amenable number.

28015815089 is a deficient number, since it is larger than the sum of its proper divisors (1).

28015815089 is an equidigital number, since it uses as much as digits as its factorization.

28015815089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 47.

The spelling of 28015815089 in words is "twenty-eight billion, fifteen million, eight hundred fifteen thousand, eighty-nine".