684897448 has 8 divisors (see below), whose sum is σ = 1284182730. Its totient is φ = 342448720.

The previous prime is 684897439. The next prime is 684897449. The reversal of 684897448 is 844798486.

It can be written as a sum of positive squares in only one way, i.e., 683404164 + 1493284 = 26142^2 + 1222^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 684897392 and 684897401.

It is not an unprimeable number, because it can be changed into a prime (684897449) 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 as a sum of consecutive naturals, namely, 42806083 + ... + 42806098.

Almost surely, 2^684897448 is an apocalyptic number.

It is an amenable number.

684897448 is a deficient number, since it is larger than the sum of its proper divisors (599285282).

684897448 is a wasteful number, since it uses less digits than its factorization.

684897448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85612187 (or 85612183 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 58.

The square root of 684897448 is about 26170.5454280189. The cubic root of 684897448 is about 881.4719888891.

The spelling of 684897448 in words is "six hundred eighty-four million, eight hundred ninety-seven thousand, four hundred forty-eight".