2878256281 has 4 divisors (see below), whose sum is σ = 3047565492. Its totient is φ = 2708947072.

The previous prime is 2878256267. The next prime is 2878256323. The reversal of 2878256281 is 1826528782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1083463056 + 1794793225 = 32916^2 + 42365^2 .

It is a cyclic number.

It is not a de Polignac number, because 2878256281 - 2⁹ = 2878255769 is a prime.

It is a super-2 number, since 2×2878256281² = 16568718438231901922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2878256231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84654580 + ... + 84654613.

It is an arithmetic number, because the mean of its divisors is an integer number (761891373).

Almost surely, 2^2878256281 is an apocalyptic number.

It is an amenable number.

2878256281 is a deficient number, since it is larger than the sum of its proper divisors (169309211).

2878256281 is a wasteful number, since it uses less digits than its factorization.

2878256281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169309210.

The product of its digits is 860160, while the sum is 49.

The square root of 2878256281 is about 53649.3828575875. The cubic root of 2878256281 is about 1422.4701238985.

The spelling of 2878256281 in words is "two billion, eight hundred seventy-eight million, two hundred fifty-six thousand, two hundred eighty-one".