663520 has 96 divisors (see below), whose sum is σ = 1905120. Its totient is φ = 215040.

The previous prime is 663517. The next prime is 663529. The reversal of 663520 is 25366.

663520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 663491 and 663500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22866 + ... + 22894.

It is an arithmetic number, because the mean of its divisors is an integer number (19845).

2⁶⁶³⁵²⁰ 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 663520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952560).

663520 is an abundant number, since it is smaller than the sum of its proper divisors (1241600).

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

663520 is a wasteful number, since it uses less digits than its factorization.

663520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 663520 is about 814.5673698351. The cubic root of 663520 is about 87.2203863342.

Adding to 663520 its reverse (25366), we get a palindrome (688886).

The spelling of 663520 in words is "six hundred sixty-three thousand, five hundred twenty".