684488 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 275712.

The previous prime is 684473. The next prime is 684493. The reversal of 684488 is 884486.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is an unprimeable number.

684488 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶⁸⁴⁴⁸⁸ is an apocalyptic number.

684488 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777600).

684488 is an abundant number, since it is smaller than the sum of its proper divisors (870712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684488 is a wasteful number, since it uses less digits than its factorization.

684488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749 (or 745 counting only the distinct ones).

The product of its digits is 49152, while the sum is 38.

The square root of 684488 is about 827.3378995308. The cubic root of 684488 is about 88.1296298894.

The spelling of 684488 in words is "six hundred eighty-four thousand, four hundred eighty-eight".