1688683687 has 8 divisors (see below), whose sum is σ = 1736127792. Its totient is φ = 1641537600.

The previous prime is 1688683681. The next prime is 1688683693. The reversal of 1688683687 is 7863868861.

It is an interprime number because it is at equal distance from previous prime (1688683681) and next prime (1688683693).

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

It is a cyclic number.

It is not a de Polignac number, because 1688683687 - 2¹⁹ = 1688159399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688683681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62989 + ... + 85702.

It is an arithmetic number, because the mean of its divisors is an integer number (217015974).

Almost surely, 2^1688683687 is an apocalyptic number.

1688683687 is a deficient number, since it is larger than the sum of its proper divisors (47444105).

1688683687 is a wasteful number, since it uses less digits than its factorization.

1688683687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149009.

The product of its digits is 18579456, while the sum is 61.

The square root of 1688683687 is about 41093.5966666341. The cubic root of 1688683687 is about 1190.8290922096.

The spelling of 1688683687 in words is "one billion, six hundred eighty-eight million, six hundred eighty-three thousand, six hundred eighty-seven".