684747799 has 2 divisors, whose sum is σ = 684747800. Its totient is φ = 684747798.

The previous prime is 684747787. The next prime is 684747803. The reversal of 684747799 is 997747486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684747799 - 2¹³ = 684739607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684747779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342373899 + 342373900.

It is an arithmetic number, because the mean of its divisors is an integer number (342373900).

Almost surely, 2^684747799 is an apocalyptic number.

684747799 is a deficient number, since it is larger than the sum of its proper divisors (1).

684747799 is an equidigital number, since it uses as much as digits as its factorization.

684747799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 61.

The square root of 684747799 is about 26167.6861606066. The cubic root of 684747799 is about 881.4077841381.

The spelling of 684747799 in words is "six hundred eighty-four million, seven hundred forty-seven thousand, seven hundred ninety-nine".