2568978321 has 24 divisors (see below), whose sum is σ = 4291043904. Its totient is φ = 1355064480.

The previous prime is 2568978299. The next prime is 2568978331. The reversal of 2568978321 is 1238798652.

It is not a de Polignac number, because 2568978321 - 2¹⁸ = 2568716177 is a prime.

It is a super-2 number, since 2×2568978321² = 13199299227535958082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2568978331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 670245 + ... + 674066.

It is an arithmetic number, because the mean of its divisors is an integer number (178793496).

Almost surely, 2^2568978321 is an apocalyptic number.

2568978321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2568978321 is a deficient number, since it is larger than the sum of its proper divisors (1722065583).

2568978321 is a wasteful number, since it uses less digits than its factorization.

2568978321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344341 (or 1344334 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 2568978321 is about 50685.0897306101. The cubic root of 2568978321 is about 1369.5781323119.

The spelling of 2568978321 in words is "two billion, five hundred sixty-eight million, nine hundred seventy-eight thousand, three hundred twenty-one".