684080128 has 22 divisors (see below), whose sum is σ = 1367494256. Its totient is φ = 342039552.

The previous prime is 684080081. The next prime is 684080129. The reversal of 684080128 is 821080486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684080129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333000 + ... + 335047.

Almost surely, 2^684080128 is an apocalyptic number.

It is an amenable number.

684080128 is a deficient number, since it is larger than the sum of its proper divisors (683414128).

684080128 is an equidigital number, since it uses as much as digits as its factorization.

684080128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668067 (or 668049 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 684080128 is about 26154.9255017100. The cubic root of 684080128 is about 881.1212154712.

It can be divided in two parts, 6840 and 80128, that added together give a palindrome (86968).

The spelling of 684080128 in words is "six hundred eighty-four million, eighty thousand, one hundred twenty-eight".