684663427 has 24 divisors (see below), whose sum is σ = 827366400. Its totient is φ = 564313680.

The previous prime is 684663409. The next prime is 684663443. The reversal of 684663427 is 724366486.

It is not a de Polignac number, because 684663427 - 2¹⁵ = 684630659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684663467) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 252324 + ... + 255022.

It is an arithmetic number, because the mean of its divisors is an integer number (34473600).

Almost surely, 2^684663427 is an apocalyptic number.

684663427 is a deficient number, since it is larger than the sum of its proper divisors (142702973).

684663427 is a wasteful number, since it uses less digits than its factorization.

684663427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911 (or 2904 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 46.

The square root of 684663427 is about 26166.0739699329. The cubic root of 684663427 is about 881.3715814212.

The spelling of 684663427 in words is "six hundred eighty-four million, six hundred sixty-three thousand, four hundred twenty-seven".