2689728738874 has 4 divisors (see below), whose sum is σ = 4034593108314. Its totient is φ = 1344864369436.

The previous prime is 2689728738863. The next prime is 2689728738883. The reversal of 2689728738874 is 4788378279862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2164850223649 + 524878515225 = 1471343^2 + 724485^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2689728738794 and 2689728738803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672432184717 + ... + 672432184720.

Almost surely, 2^{2689728738874} is an apocalyptic number.

2689728738874 is a deficient number, since it is larger than the sum of its proper divisors (1344864369440).

2689728738874 is a wasteful number, since it uses less digits than its factorization.

2689728738874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344864369439.

The product of its digits is 3641573376, while the sum is 79.

The spelling of 2689728738874 in words is "two trillion, six hundred eighty-nine billion, seven hundred twenty-eight million, seven hundred thirty-eight thousand, eight hundred seventy-four".