684071907 has 16 divisors (see below), whose sum is σ = 935413248. Its totient is φ = 444437280.

The previous prime is 684071903. The next prime is 684071939. The reversal of 684071907 is 709170486.

684071907 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684071907 - 2² = 684071903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684071903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53718 + ... + 65220.

It is an arithmetic number, because the mean of its divisors is an integer number (58463328).

Almost surely, 2^684071907 is an apocalyptic number.

684071907 is a deficient number, since it is larger than the sum of its proper divisors (251341341).

684071907 is a wasteful number, since it uses less digits than its factorization.

684071907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 684071907 is about 26154.7683415472. The cubic root of 684071907 is about 881.1176858036.

The spelling of 684071907 in words is "six hundred eighty-four million, seventy-one thousand, nine hundred seven".