684430655 has 8 divisors (see below), whose sum is σ = 822778992. Its totient is φ = 546569728.

The previous prime is 684430639. The next prime is 684430657. The reversal of 684430655 is 556034486.

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 684430655 - 2⁴ = 684430639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684430657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118754 + ... + 124383.

It is an arithmetic number, because the mean of its divisors is an integer number (102847374).

Almost surely, 2^684430655 is an apocalyptic number.

684430655 is a deficient number, since it is larger than the sum of its proper divisors (138348337).

684430655 is a wasteful number, since it uses less digits than its factorization.

684430655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243705.

The product of its (nonzero) digits is 345600, while the sum is 41.

The square root of 684430655 is about 26161.6256184512. The cubic root of 684430655 is about 881.2716871413.

The spelling of 684430655 in words is "six hundred eighty-four million, four hundred thirty thousand, six hundred fifty-five".