2688779972 has 18 divisors (see below), whose sum is σ = 4722724314. Its totient is φ = 1339448320.

The previous prime is 2688779939. The next prime is 2688779983. The reversal of 2688779972 is 2799778862.

It can be written as a sum of positive squares in 3 ways, for example, as 1621189696 + 1067590276 = 40264^2 + 32674^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2688779899 and 2688779908.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 311588 + ... + 320100.

It is an arithmetic number, because the mean of its divisors is an integer number (262373573).

Almost surely, 2^2688779972 is an apocalyptic number.

It is an amenable number.

2688779972 is a deficient number, since it is larger than the sum of its proper divisors (2033944342).

2688779972 is an equidigital number, since it uses as much as digits as its factorization.

2688779972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9079 (or 8796 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 65.

The square root of 2688779972 is about 51853.4470599593. The cubic root of 2688779972 is about 1390.5451292473.

The spelling of 2688779972 in words is "two billion, six hundred eighty-eight million, seven hundred seventy-nine thousand, nine hundred seventy-two".