660003520 has 112 divisors (see below), whose sum is σ = 1733080608. Its totient is φ = 237404160.

The previous prime is 660003493. The next prime is 660003523. The reversal of 660003520 is 25300066.

660003520 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 = 660003491 and 660003500.

It is not an unprimeable number, because it can be changed into a prime (660003523) 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, 340474 + ... + 342406.

It is an arithmetic number, because the mean of its divisors is an integer number (15473934).

Almost surely, 2^660003520 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 660003520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (866540304).

660003520 is an abundant number, since it is smaller than the sum of its proper divisors (1073077088).

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

660003520 is a wasteful number, since it uses less digits than its factorization.

660003520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058 (or 2048 counting only the distinct ones).

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

The square root of 660003520 is about 25690.5336651460. The cubic root of 660003520 is about 870.6603169524.

Adding to 660003520 its reverse (25300066), we get a palindrome (685303586).

The spelling of 660003520 in words is "six hundred sixty million, three thousand, five hundred twenty".