2644868880 has 60 divisors (see below), whose sum is σ = 8882353740. Its totient is φ = 705298176.

The previous prime is 2644868873. The next prime is 2644868899. The reversal of 2644868880 is 888684462.

2644868880 is a `hidden beast` number, since 2 + 6 + 4 + 486 + 88 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1187767296 + 1457101584 = 34464^2 + 38172^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1835995 + ... + 1837434.

It is an arithmetic number, because the mean of its divisors is an integer number (148039229).

Almost surely, 2^2644868880 is an apocalyptic number.

2644868880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2644868880 is an abundant number, since it is smaller than the sum of its proper divisors (6237484860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2644868880 is a wasteful number, since it uses less digits than its factorization.

2644868880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673448 (or 3673439 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 54.

The square root of 2644868880 is about 51428.2887135086. The cubic root of 2644868880 is about 1382.9337712163.

The spelling of 2644868880 in words is "two billion, six hundred forty-four million, eight hundred sixty-eight thousand, eight hundred eighty".