684682225 has 24 divisors (see below), whose sum is σ = 923264568. Its totient is φ = 501580800.

The previous prime is 684682223. The next prime is 684682231. The reversal of 684682225 is 522286486.

It can be written as a sum of positive squares in 12 ways, for example, as 96668224 + 588014001 = 9832^2 + 24249^2 .

It is not a de Polignac number, because 684682225 - 2¹ = 684682223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684682223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6046 + ... + 37495.

It is an arithmetic number, because the mean of its divisors is an integer number (38469357).

Almost surely, 2^684682225 is an apocalyptic number.

It is an amenable number.

684682225 is a deficient number, since it is larger than the sum of its proper divisors (238582343).

684682225 is a wasteful number, since it uses less digits than its factorization.

684682225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43605 (or 43600 counting only the distinct ones).

The product of its digits is 368640, while the sum is 43.

The square root of 684682225 is about 26166.4331730559. The cubic root of 684682225 is about 881.3796476090.

The spelling of 684682225 in words is "six hundred eighty-four million, six hundred eighty-two thousand, two hundred twenty-five".