684668823 has 8 divisors (see below), whose sum is σ = 915523968. Its totient is φ = 455129784.

The previous prime is 684668783. The next prime is 684668827. The reversal of 684668823 is 328866486.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 684668823 - 2⁹ = 684668311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684668827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327811 + ... + 329892.

It is an arithmetic number, because the mean of its divisors is an integer number (114440496).

Almost surely, 2^684668823 is an apocalyptic number.

684668823 is a deficient number, since it is larger than the sum of its proper divisors (230855145).

684668823 is a wasteful number, since it uses less digits than its factorization.

684668823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658053.

The product of its digits is 2654208, while the sum is 51.

The square root of 684668823 is about 26166.1770803455. The cubic root of 684668823 is about 881.3738968502.

The spelling of 684668823 in words is "six hundred eighty-four million, six hundred sixty-eight thousand, eight hundred twenty-three".