2688769509 has 16 divisors (see below), whose sum is σ = 3627348480. Its totient is φ = 1771433840.

The previous prime is 2688769441. The next prime is 2688769513. The reversal of 2688769509 is 9059678862.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2688769509 - 2¹² = 2688765413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2688769579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124504 + ... + 144494.

It is an arithmetic number, because the mean of its divisors is an integer number (226709280).

Almost surely, 2^2688769509 is an apocalyptic number.

It is an amenable number.

2688769509 is a deficient number, since it is larger than the sum of its proper divisors (938578971).

2688769509 is a wasteful number, since it uses less digits than its factorization.

2688769509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20520.

The product of its (nonzero) digits is 13063680, while the sum is 60.

The square root of 2688769509 is about 51853.3461697507. The cubic root of 2688769509 is about 1390.5433255429.

The spelling of 2688769509 in words is "two billion, six hundred eighty-eight million, seven hundred sixty-nine thousand, five hundred nine".