2122781728 has 24 divisors (see below), whose sum is σ = 4180252860. Its totient is φ = 1061130240.

The previous prime is 2122781651. The next prime is 2122781779. The reversal of 2122781728 is 8271872212.

It can be written as a sum of positive squares in 2 ways, for example, as 1885991184 + 236790544 = 43428^2 + 15388^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 254488 + ... + 262696.

Almost surely, 2^2122781728 is an apocalyptic number.

It is an amenable number.

2122781728 is a deficient number, since it is larger than the sum of its proper divisors (2057471132).

2122781728 is an equidigital number, since it uses as much as digits as its factorization.

2122781728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16300 (or 16292 counting only the distinct ones).

The product of its digits is 50176, while the sum is 40.

The square root of 2122781728 is about 46073.6554660036. The cubic root of 2122781728 is about 1285.1932825583.

The spelling of 2122781728 in words is "two billion, one hundred twenty-two million, seven hundred eighty-one thousand, seven hundred twenty-eight".