684267128 has 8 divisors (see below), whose sum is σ = 1283000880. Its totient is φ = 342133560.

The previous prime is 684267109. The next prime is 684267131. The reversal of 684267128 is 821762486.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×684267128² = 936443004922736768, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 42766688 + ... + 42766703.

It is an arithmetic number, because the mean of its divisors is an integer number (160375110).

Almost surely, 2^684267128 is an apocalyptic number.

It is an amenable number.

684267128 is a deficient number, since it is larger than the sum of its proper divisors (598733752).

684267128 is a wasteful number, since it uses less digits than its factorization.

684267128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85533397 (or 85533393 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 684267128 is about 26158.5001099069. The cubic root of 684267128 is about 881.2014958600.

The spelling of 684267128 in words is "six hundred eighty-four million, two hundred sixty-seven thousand, one hundred twenty-eight".