686148660 has 72 divisors (see below), whose sum is σ = 2089747296. Its totient is φ = 182232000.

The previous prime is 686148649. The next prime is 686148703. The reversal of 686148660 is 66841686.

It is a super-3 number, since 3×686148660³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37587 + ... + 52773.

It is an arithmetic number, because the mean of its divisors is an integer number (29024268).

Almost surely, 2^686148660 is an apocalyptic number.

686148660 is a gapful number since it is divisible by the number (60) 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 686148660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1044873648).

686148660 is an abundant number, since it is smaller than the sum of its proper divisors (1403598636).

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

686148660 is a wasteful number, since it uses less digits than its factorization.

686148660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15453 (or 15448 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 686148660 is about 26194.4394862727. The cubic root of 686148660 is about 882.0084377615.

The spelling of 686148660 in words is "six hundred eighty-six million, one hundred forty-eight thousand, six hundred sixty".