648704 has 40 divisors (see below), whose sum is σ = 1489488. Its totient is φ = 276480.

The previous prime is 648689. The next prime is 648709. The reversal of 648704 is 407846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648709) by changing a digit.

648704 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3494 + ... + 3674.

2⁶⁴⁸⁷⁰⁴ is an apocalyptic number.

648704 is a gapful number since it is divisible by the number (64) 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 648704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744744).

648704 is an abundant number, since it is smaller than the sum of its proper divisors (840784).

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

648704 is an equidigital number, since it uses as much as digits as its factorization.

648704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 648704 is about 805.4216287138. The cubic root of 648704 is about 86.5663006451.

The spelling of 648704 in words is "six hundred forty-eight thousand, seven hundred four".