684665307 has 12 divisors (see below), whose sum is σ = 1011960664. Its totient is φ = 445828320.

The previous prime is 684665299. The next prime is 684665329. The reversal of 684665307 is 703566486.

It is not a de Polignac number, because 684665307 - 2³ = 684665299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684665407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 884194 + ... + 884967.

Almost surely, 2^684665307 is an apocalyptic number.

684665307 is a deficient number, since it is larger than the sum of its proper divisors (327295357).

684665307 is a wasteful number, since it uses less digits than its factorization.

684665307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769210 (or 1769207 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 684665307 is about 26166.1098942888. The cubic root of 684665307 is about 881.3723881325.

The spelling of 684665307 in words is "six hundred eighty-four million, six hundred sixty-five thousand, three hundred seven".