1686896568 has 96 divisors (see below), whose sum is σ = 5227428960. Its totient is φ = 481409280.

The previous prime is 1686896557. The next prime is 1686896593. The reversal of 1686896568 is 8656986861.

1686896568 is a `hidden beast` number, since 1 + 6 + 8 + 68 + 9 + 6 + 568 = 666.

It is a super-2 number, since 2×1686896568² = 5691240062260357248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

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 in 23 ways as a sum of consecutive naturals, for example, 642298 + ... + 644918.

It is an arithmetic number, because the mean of its divisors is an integer number (54452385).

Almost surely, 2^1686896568 is an apocalyptic number.

1686896568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686896568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2613714480).

1686896568 is an abundant number, since it is smaller than the sum of its proper divisors (3540532392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686896568 is a wasteful number, since it uses less digits than its factorization.

1686896568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3917 (or 3910 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The square root of 1686896568 is about 41071.8464157627. The cubic root of 1686896568 is about 1190.4088626367.

The spelling of 1686896568 in words is "one billion, six hundred eighty-six million, eight hundred ninety-six thousand, five hundred sixty-eight".