2688829921 has 4 divisors (see below), whose sum is σ = 2689380144. Its totient is φ = 2688279700.

The previous prime is 2688829879. The next prime is 2688829931. The reversal of 2688829921 is 1299288862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2688829921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2688829931) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 267715 + ... + 277576.

It is an arithmetic number, because the mean of its divisors is an integer number (672345036).

Almost surely, 2^2688829921 is an apocalyptic number.

It is an amenable number.

2688829921 is a deficient number, since it is larger than the sum of its proper divisors (550223).

2688829921 is an equidigital number, since it uses as much as digits as its factorization.

2688829921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550222.

The product of its digits is 1990656, while the sum is 55.

The square root of 2688829921 is about 51853.9286939765. The cubic root of 2688829921 is about 1390.5537398327.

The spelling of 2688829921 in words is "two billion, six hundred eighty-eight million, eight hundred twenty-nine thousand, nine hundred twenty-one".