684686479 has 2 divisors, whose sum is σ = 684686480. Its totient is φ = 684686478.

The previous prime is 684686477. The next prime is 684686501. The reversal of 684686479 is 974686486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684686479 - 2¹ = 684686477 is a prime.

Together with 684686477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684686477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342343239 + 342343240.

It is an arithmetic number, because the mean of its divisors is an integer number (342343240).

Almost surely, 2^684686479 is an apocalyptic number.

684686479 is a deficient number, since it is larger than the sum of its proper divisors (1).

684686479 is an equidigital number, since it uses as much as digits as its factorization.

684686479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 58.

The square root of 684686479 is about 26166.5144602792. The cubic root of 684686479 is about 881.3814729722.

It can be divided in two parts, 68468 and 6479, that added together give a palindrome (74947).

The spelling of 684686479 in words is "six hundred eighty-four million, six hundred eighty-six thousand, four hundred seventy-nine".