2789778489169 has 45 divisors (see below), whose sum is σ = 3300143250203. Its totient is φ = 2358197562336.

The previous prime is 2789778489149. The next prime is 2789778489191. The reversal of 2789778489169 is 9619848779872.

The square root of 2789778489169 is 1670263.

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

2789778489169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 535696639569 + 2254081849600 = 731913^2 + 1501360^2 .

It is not a de Polignac number, because 2789778489169 - 2⁷ = 2789778489041 is a prime.

It is a super-2 number, since 2×2789778489169² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (6145155072) is a multiple of the sum of its prime factors (972).

It is not an unprimeable number, because it can be changed into a prime (2789778489149) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7284016752 + ... + 7284017134.

Almost surely, 2^{2789778489169} is an apocalyptic number.

2789778489169 is the 1670263-rd square number.

2789778489169 is the 835132-nd centered octagonal number.

It is an amenable number.

2789778489169 is a deficient number, since it is larger than the sum of its proper divisors (510364761034).

2789778489169 is an frugal number, since it uses more digits than its factorization.

2789778489169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972 (or 479 counting only the distinct ones).

The product of its digits is 6145155072, while the sum is 85.

The spelling of 2789778489169 in words is "two trillion, seven hundred eighty-nine billion, seven hundred seventy-eight million, four hundred eighty-nine thousand, one hundred sixty-nine".