2688944690 has 8 divisors (see below), whose sum is σ = 4840100460. Its totient is φ = 1075577872.

The previous prime is 2688944639. The next prime is 2688944717. The reversal of 2688944690 is 964498862.

It can be written as a sum of positive squares in 2 ways, for example, as 2686245241 + 2699449 = 51829^2 + 1643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2688944690² = 14460847091758392200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134447225 + ... + 134447244.

Almost surely, 2^2688944690 is an apocalyptic number.

2688944690 is a deficient number, since it is larger than the sum of its proper divisors (2151155770).

2688944690 is a wasteful number, since it uses less digits than its factorization.

2688944690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268894476.

The product of its (nonzero) digits is 5971968, while the sum is 56.

The square root of 2688944690 is about 51855.0353389138. The cubic root of 2688944690 is about 1390.5735241746.

The spelling of 2688944690 in words is "two billion, six hundred eighty-eight million, nine hundred forty-four thousand, six hundred ninety".