684681425 has 6 divisors (see below), whose sum is σ = 849004998. Its totient is φ = 547745120.

The previous prime is 684681391. The next prime is 684681433. The reversal of 684681425 is 524186486.

It is a happy number.

684681425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 47169424 + 637512001 = 6868^2 + 25249^2 .

It is not a de Polignac number, because 684681425 - 2¹⁴ = 684665041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13693604 + ... + 13693653.

It is an arithmetic number, because the mean of its divisors is an integer number (141500833).

Almost surely, 2^684681425 is an apocalyptic number.

It is an amenable number.

684681425 is a deficient number, since it is larger than the sum of its proper divisors (164323573).

684681425 is a wasteful number, since it uses less digits than its factorization.

684681425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27387267 (or 27387262 counting only the distinct ones).

The product of its digits is 368640, while the sum is 44.

The square root of 684681425 is about 26166.4178862908. The cubic root of 684681425 is about 881.3793043335.

The spelling of 684681425 in words is "six hundred eighty-four million, six hundred eighty-one thousand, four hundred twenty-five".