1686668872 has 64 divisors (see below), whose sum is σ = 3891888000. Its totient is φ = 668783616.

The previous prime is 1686668861. The next prime is 1686668899. The reversal of 1686668872 is 2788666861.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41154 + ... + 71182.

It is an arithmetic number, because the mean of its divisors is an integer number (60810750).

Almost surely, 2^1686668872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686668872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1945944000).

1686668872 is an abundant number, since it is smaller than the sum of its proper divisors (2205219128).

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

1686668872 is a wasteful number, since it uses less digits than its factorization.

1686668872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30118 (or 30114 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 58.

The square root of 1686668872 is about 41069.0743991145. The cubic root of 1686668872 is about 1190.3553000694.

The spelling of 1686668872 in words is "one billion, six hundred eighty-six million, six hundred sixty-eight thousand, eight hundred seventy-two".