2878081921 has 24 divisors (see below), whose sum is σ = 3433110912. Its totient is φ = 2396565600.

The previous prime is 2878081907. The next prime is 2878081937. The reversal of 2878081921 is 1291808782.

It is not a de Polignac number, because 2878081921 - 2¹³ = 2878073729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2878081951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199080 + ... + 213046.

It is an arithmetic number, because the mean of its divisors is an integer number (143046288).

Almost surely, 2^2878081921 is an apocalyptic number.

It is an amenable number.

2878081921 is a deficient number, since it is larger than the sum of its proper divisors (555028991).

2878081921 is a wasteful number, since it uses less digits than its factorization.

2878081921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14133 (or 14122 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 2878081921 is about 53647.7578375835. The cubic root of 2878081921 is about 1422.4413996902.

The spelling of 2878081921 in words is "two billion, eight hundred seventy-eight million, eighty-one thousand, nine hundred twenty-one".