684651768 has 32 divisors (see below), whose sum is σ = 1712914560. Its totient is φ = 228045920.

The previous prime is 684651767. The next prime is 684651769. The reversal of 684651768 is 867156486.

It is an interprime number because it is at equal distance from previous prime (684651767) and next prime (684651769).

It is a self number, because there is not a number n which added to its sum of digits gives 684651768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684651767) 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 7 ways as a sum of consecutive naturals, for example, 24253 + ... + 44243.

It is an arithmetic number, because the mean of its divisors is an integer number (53528580).

Almost surely, 2^684651768 is an apocalyptic number.

It is an amenable number.

684651768 is an abundant number, since it is smaller than the sum of its proper divisors (1028262792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684651768 is a wasteful number, since it uses less digits than its factorization.

684651768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21427 (or 21423 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 684651768 is about 26165.8511804986. The cubic root of 684651768 is about 881.3665784912.

The spelling of 684651768 in words is "six hundred eighty-four million, six hundred fifty-one thousand, seven hundred sixty-eight".