28545116209 has 9 divisors (see below), whose sum is σ = 28832646297. Its totient is φ = 28260430404.

The previous prime is 28545116167. The next prime is 28545116251. The reversal of 28545116209 is 90261154582.

The square root of 28545116209 is 168953.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (28545116167) and next prime (28545116251).

It is a de Polignac number, because none of the positive numbers 2^k-28545116209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28545116269) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18077182 + ... + 18078760.

Almost surely, 2^28545116209 is an apocalyptic number.

28545116209 is the 168953-rd square number.

28545116209 is the 84477-th centered octagonal number.

It is an amenable number.

28545116209 is a deficient number, since it is larger than the sum of its proper divisors (287530088).

28545116209 is an frugal number, since it uses more digits than its factorization.

28545116209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 28545116209 in words is "twenty-eight billion, five hundred forty-five million, one hundred sixteen thousand, two hundred nine".