686041672720 has 40 divisors (see below), whose sum is σ = 1597265447040. Its totient is φ = 274034981760.

The previous prime is 686041672691. The next prime is 686041672733. The reversal of 686041672720 is 27276140686.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 5905986 + ... + 6021025.

It is an arithmetic number, because the mean of its divisors is an integer number (39931636176).

Almost surely, 2^686041672720 is an apocalyptic number.

It is an amenable number.

686041672720 is an abundant number, since it is smaller than the sum of its proper divisors (911223774320).

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

686041672720 is a wasteful number, since it uses less digits than its factorization.

686041672720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11927743 (or 11927737 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 686041672720 in words is "six hundred eighty-six billion, forty-one million, six hundred seventy-two thousand, seven hundred twenty".