648520 has 32 divisors (see below), whose sum is σ = 1509120. Its totient is φ = 250560.

The previous prime is 648509. The next prime is 648563. The reversal of 648520 is 25846.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (47160).

2⁶⁴⁸⁵²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754560).

648520 is an abundant number, since it is smaller than the sum of its proper divisors (860600).

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

648520 is a wasteful number, since it uses less digits than its factorization.

648520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 648520 is about 805.3073947258. The cubic root of 648520 is about 86.5581152449.

The spelling of 648520 in words is "six hundred forty-eight thousand, five hundred twenty".