686720944 has 40 divisors (see below), whose sum is σ = 1637568800. Its totient is φ = 271669248.

The previous prime is 686720929. The next prime is 686720953. The reversal of 686720944 is 449027686.

It is a happy number.

686720944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686720944² = 943171309856502272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686720894 and 686720903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234369 + ... + 237280.

It is an arithmetic number, because the mean of its divisors is an integer number (40939220).

Almost surely, 2^686720944 is an apocalyptic number.

It is an amenable number.

686720944 is an abundant number, since it is smaller than the sum of its proper divisors (950847856).

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

686720944 is a wasteful number, since it uses less digits than its factorization.

686720944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471677 (or 471671 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 686720944 is about 26205.3609782426. The cubic root of 686720944 is about 882.2535833980.

The spelling of 686720944 in words is "six hundred eighty-six million, seven hundred twenty thousand, nine hundred forty-four".