1688731768 has 32 divisors (see below), whose sum is σ = 3202650000. Its totient is φ = 834727680.

The previous prime is 1688731757. The next prime is 1688731787. The reversal of 1688731768 is 8671378861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433188 + ... + 437068.

Almost surely, 2^1688731768 is an apocalyptic number.

It is an amenable number.

1688731768 is a deficient number, since it is larger than the sum of its proper divisors (1513918232).

1688731768 is a wasteful number, since it uses less digits than its factorization.

1688731768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495 (or 4491 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 55.

The square root of 1688731768 is about 41094.1816806224. The cubic root of 1688731768 is about 1190.8403940519.

The spelling of 1688731768 in words is "one billion, six hundred eighty-eight million, seven hundred thirty-one thousand, seven hundred sixty-eight".