684804436 has 24 divisors (see below), whose sum is σ = 1233589896. Its totient is φ = 332392320.

The previous prime is 684804431. The next prime is 684804493. The reversal of 684804436 is 634408486.

It can be written as a sum of positive squares in 4 ways, for example, as 126427536 + 558376900 = 11244^2 + 23630^2 .

It is a junction number, because it is equal to n+sod(n) for n = 684804392 and 684804401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684804431) 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, 63210 + ... + 73246.

It is an arithmetic number, because the mean of its divisors is an integer number (51399579).

Almost surely, 2^684804436 is an apocalyptic number.

It is an amenable number.

684804436 is a deficient number, since it is larger than the sum of its proper divisors (548785460).

684804436 is a wasteful number, since it uses less digits than its factorization.

684804436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10539 (or 10537 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

The square root of 684804436 is about 26168.7683317347. The cubic root of 684804436 is about 881.4320845284.

The spelling of 684804436 in words is "six hundred eighty-four million, eight hundred four thousand, four hundred thirty-six".