684931457 has 12 divisors (see below), whose sum is σ = 818293140. Its totient is φ = 571215456.

The previous prime is 684931417. The next prime is 684931463. The reversal of 684931457 is 754139486.

It can be written as a sum of positive squares in 2 ways, for example, as 485585296 + 199346161 = 22036^2 + 14119^2 .

It is a de Polignac number, because none of the positive numbers 2^k-684931457 is a prime.

It is a super-2 number, since 2×684931457² = 938262201576285698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684931417) 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 in 11 ways as a sum of consecutive naturals, for example, 187082 + ... + 190707.

It is an arithmetic number, because the mean of its divisors is an integer number (68191095).

Almost surely, 2^684931457 is an apocalyptic number.

It is an amenable number.

684931457 is a deficient number, since it is larger than the sum of its proper divisors (133361683).

684931457 is a wasteful number, since it uses less digits than its factorization.

684931457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377840 (or 377833 counting only the distinct ones).

The product of its digits is 725760, while the sum is 47.

The square root of 684931457 is about 26171.1951771408. The cubic root of 684931457 is about 881.4865786571.

The spelling of 684931457 in words is "six hundred eighty-four million, nine hundred thirty-one thousand, four hundred fifty-seven".