684326817 has 12 divisors (see below), whose sum is σ = 988700544. Its totient is φ = 456112440.

The previous prime is 684326807. The next prime is 684326821. The reversal of 684326817 is 718623486.

It is not a de Polignac number, because 684326817 - 2⁴ = 684326801 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (684326807) 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, 64392 + ... + 74262.

It is an arithmetic number, because the mean of its divisors is an integer number (82391712).

Almost surely, 2^684326817 is an apocalyptic number.

It is an amenable number.

684326817 is a deficient number, since it is larger than the sum of its proper divisors (304373727).

684326817 is a wasteful number, since it uses less digits than its factorization.

684326817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17580 (or 17577 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 684326817 is about 26159.6409952430. The cubic root of 684326817 is about 881.2271176796.

The spelling of 684326817 in words is "six hundred eighty-four million, three hundred twenty-six thousand, eight hundred seventeen".