684450245 has 8 divisors (see below), whose sum is σ = 821864184. Its totient is φ = 547210944.

The previous prime is 684450227. The next prime is 684450251. The reversal of 684450245 is 542054486.

684450245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 26162²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 684450244 = 1^2 + 26162^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684450245 - 2⁶ = 684450181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684450199 and 684450208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34874 + ... + 50843.

It is an arithmetic number, because the mean of its divisors is an integer number (102733023).

Almost surely, 2^684450245 is an apocalyptic number.

It is an amenable number.

684450245 is a deficient number, since it is larger than the sum of its proper divisors (137413939).

684450245 is a wasteful number, since it uses less digits than its factorization.

684450245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87319.

The product of its (nonzero) digits is 153600, while the sum is 38.

The square root of 684450245 is about 26162.0000191117. Note that the first 4 decimals coincide. The cubic root of 684450245 is about 881.2800950774.

The spelling of 684450245 in words is "six hundred eighty-four million, four hundred fifty thousand, two hundred forty-five".