684381448 has 16 divisors (see below), whose sum is σ = 1304252460. Its totient is φ = 336580800.

The previous prime is 684381413. The next prime is 684381457. The reversal of 684381448 is 844183486.

It can be written as a sum of positive squares in 2 ways, for example, as 638168644 + 46212804 = 25262^2 + 6798^2 .

It is a junction number, because it is equal to n+sod(n) for n = 684381398 and 684381407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700723 + ... + 701698.

Almost surely, 2^684381448 is an apocalyptic number.

It is an amenable number.

684381448 is a deficient number, since it is larger than the sum of its proper divisors (619871012).

684381448 is a wasteful number, since it uses less digits than its factorization.

684381448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402488 (or 1402484 counting only the distinct ones).

The product of its digits is 589824, while the sum is 46.

The square root of 684381448 is about 26160.6851592232. The cubic root of 684381448 is about 881.2505670201.

The spelling of 684381448 in words is "six hundred eighty-four million, three hundred eighty-one thousand, four hundred forty-eight".