686466660 has 48 divisors (see below), whose sum is σ = 2096845632. Its totient is φ = 166416000.

The previous prime is 686466617. The next prime is 686466679. The reversal of 686466660 is 66664686.

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, 519391 + ... + 520710.

It is an arithmetic number, because the mean of its divisors is an integer number (43684284).

Almost surely, 2^686466660 is an apocalyptic number.

686466660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686466660 is an abundant number, since it is smaller than the sum of its proper divisors (1410378972).

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

686466660 is a wasteful number, since it uses less digits than its factorization.

686466660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040124 (or 1040122 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The square root of 686466660 is about 26200.5087736861. The cubic root of 686466660 is about 882.1446742075.

The spelling of 686466660 in words is "six hundred eighty-six million, four hundred sixty-six thousand, six hundred sixty".