2561878888 has 16 divisors (see below), whose sum is σ = 4804380000. Its totient is φ = 1280710896.

The previous prime is 2561878859. The next prime is 2561878901. The reversal of 2561878888 is 8888781652.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24973 + ... + 75811.

It is an arithmetic number, because the mean of its divisors is an integer number (300273750).

Almost surely, 2^2561878888 is an apocalyptic number.

It is an amenable number.

2561878888 is a deficient number, since it is larger than the sum of its proper divisors (2242501112).

2561878888 is a wasteful number, since it uses less digits than its factorization.

2561878888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57144 (or 57140 counting only the distinct ones).

The product of its digits is 13762560, while the sum is 61.

The square root of 2561878888 is about 50615.0065494414. The cubic root of 2561878888 is about 1368.3153477156.

The spelling of 2561878888 in words is "two billion, five hundred sixty-one million, eight hundred seventy-eight thousand, eight hundred eighty-eight".