2878393875889 has 81 divisors (see below), whose sum is σ = 3638786734947. Its totient is φ = 2269783746048.

The previous prime is 2878393875871. The next prime is 2878393875913. The reversal of 2878393875889 is 9885783938782.

The square root of 2878393875889 is 1696583.

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

It can be written as a sum of positive squares in 13 ways, for example, as 1444243922289 + 1434149953600 = 1201767^2 + 1197560^2 .

It is not a de Polignac number, because 2878393875889 - 2¹¹ = 2878393873841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2878393875829) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 10700348847 + ... + 10700349115.

Almost surely, 2^{2878393875889} is an apocalyptic number.

2878393875889 is the 1696583-rd square number.

2878393875889 is the 848292-nd centered octagonal number.

It is an amenable number.

2878393875889 is a deficient number, since it is larger than the sum of its proper divisors (760392859058).

2878393875889 is an frugal number, since it uses more digits than its factorization.

2878393875889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 346 counting only the distinct ones).

The product of its digits is 11705057280, while the sum is 85.

The spelling of 2878393875889 in words is "two trillion, eight hundred seventy-eight billion, three hundred ninety-three million, eight hundred seventy-five thousand, eight hundred eighty-nine".