686229660 has 36 divisors (see below), whose sum is σ = 2081563848. Its totient is φ = 182994528.

The previous prime is 686229659. The next prime is 686229673. The reversal of 686229660 is 66922686.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×686229660² = 941822292527431200, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1906014 + ... + 1906373.

It is an arithmetic number, because the mean of its divisors is an integer number (57821218).

Almost surely, 2^686229660 is an apocalyptic number.

686229660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686229660 is an abundant number, since it is smaller than the sum of its proper divisors (1395334188).

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

686229660 is a wasteful number, since it uses less digits than its factorization.

686229660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812402 (or 3812397 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 686229660 is about 26195.9855703121. The cubic root of 686229660 is about 882.0431434925.

The spelling of 686229660 in words is "six hundred eighty-six million, two hundred twenty-nine thousand, six hundred sixty".