12878391289 has 9 divisors (see below), whose sum is σ = 12956368719. Its totient is φ = 12800882400.

The previous prime is 12878391277. The next prime is 12878391299. The reversal of 12878391289 is 98219387821.

The square root of 12878391289 is 113483.

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

It can be written as a sum of positive squares in only one way, i.e., 12750248889 + 128142400 = 112917^2 + 11320^2 .

It is not a de Polignac number, because 12878391289 - 2²³ = 12870002681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12878391299) 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, 32115489 + ... + 32115889.

Almost surely, 2^12878391289 is an apocalyptic number.

12878391289 is the 113483-rd square number.

12878391289 is the 56742-nd centered octagonal number.

It is an amenable number.

12878391289 is a deficient number, since it is larger than the sum of its proper divisors (77977430).

12878391289 is an frugal number, since it uses more digits than its factorization.

12878391289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 684 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 58.

The spelling of 12878391289 in words is "twelve billion, eight hundred seventy-eight million, three hundred ninety-one thousand, two hundred eighty-nine".