648680 has 16 divisors (see below), whose sum is σ = 1459620. Its totient is φ = 259456.

The previous prime is 648677. The next prime is 648689. The reversal of 648680 is 86846.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 5476 = 802^2 + 74^2 .

It is not an unprimeable number, because it can be changed into a prime (648689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8069 + ... + 8148.

2⁶⁴⁸⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

648680 is an abundant number, since it is smaller than the sum of its proper divisors (810940).

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

648680 is a wasteful number, since it uses less digits than its factorization.

648680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16228 (or 16224 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 648680 is about 805.4067295473. The cubic root of 648680 is about 86.5652330720.

The spelling of 648680 in words is "six hundred forty-eight thousand, six hundred eighty".