1688688842 has 8 divisors (see below), whose sum is σ = 2643165216. Its totient is φ = 807633772.

The previous prime is 1688688797. The next prime is 1688688847. The reversal of 1688688842 is 2488868861.

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

It is not an unprimeable number, because it can be changed into a prime (1688688847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18355268 + ... + 18355359.

It is an arithmetic number, because the mean of its divisors is an integer number (330395652).

Almost surely, 2^1688688842 is an apocalyptic number.

1688688842 is a deficient number, since it is larger than the sum of its proper divisors (954476374).

1688688842 is a wasteful number, since it uses less digits than its factorization.

1688688842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36710652.

The product of its digits is 9437184, while the sum is 59.

The square root of 1688688842 is about 41093.6593892537. The cubic root of 1688688842 is about 1190.8303039458.

The spelling of 1688688842 in words is "one billion, six hundred eighty-eight million, six hundred eighty-eight thousand, eight hundred forty-two".