684461285 has 4 divisors (see below), whose sum is σ = 821353548. Its totient is φ = 547569024.

The previous prime is 684461251. The next prime is 684461291. The reversal of 684461285 is 582164486.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 425927044 + 258534241 = 20638^2 + 16079^2 .

It is a cyclic number.

It is not a de Polignac number, because 684461285 - 2¹⁰ = 684460261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 68446124 + ... + 68446133.

It is an arithmetic number, because the mean of its divisors is an integer number (205338387).

Almost surely, 2^684461285 is an apocalyptic number.

It is an amenable number.

684461285 is a deficient number, since it is larger than the sum of its proper divisors (136892263).

684461285 is a wasteful number, since it uses less digits than its factorization.

684461285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136892262.

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

The square root of 684461285 is about 26162.2110113041. The cubic root of 684461285 is about 881.2848333229.

The spelling of 684461285 in words is "six hundred eighty-four million, four hundred sixty-one thousand, two hundred eighty-five".