684316798731 has 24 divisors (see below), whose sum is σ = 1005787872960. Its totient is φ = 448221484656.

The previous prime is 684316798727. The next prime is 684316798889. The reversal of 684316798731 is 137897613486.

684316798731 is a `hidden beast` number, since 68 + 431 + 6 + 79 + 8 + 73 + 1 = 666.

It is not a de Polignac number, because 684316798731 - 2² = 684316798727 is a prime.

It is a super-2 number, since 2×684316798731² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684316794731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 558816 + ... + 1296498.

It is an arithmetic number, because the mean of its divisors is an integer number (41907828040).

Almost surely, 2^684316798731 is an apocalyptic number.

684316798731 is a deficient number, since it is larger than the sum of its proper divisors (321471074229).

684316798731 is a wasteful number, since it uses less digits than its factorization.

684316798731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739495 (or 739492 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 684316798731 in words is "six hundred eighty-four billion, three hundred sixteen million, seven hundred ninety-eight thousand, seven hundred thirty-one".