6601520 has 40 divisors (see below), whose sum is σ = 15467760. Its totient is φ = 2620160.

The previous prime is 6601519. The next prime is 6601523. The reversal of 6601520 is 251066.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 6601492 and 6601501.

It is not an unprimeable number, because it can be changed into a prime (6601523) 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 7 ways as a sum of consecutive naturals, for example, 14090 + ... + 14550.

It is an arithmetic number, because the mean of its divisors is an integer number (386694).

Almost surely, 2^6601520 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 6601520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7733880).

6601520 is an abundant number, since it is smaller than the sum of its proper divisors (8866240).

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

6601520 is a wasteful number, since it uses less digits than its factorization.

6601520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 6601520 is about 2569.3423283012. The cubic root of 6601520 is about 187.5921443391.

Adding to 6601520 its reverse (251066), we get a palindrome (6852586).

The spelling of 6601520 in words is "six million, six hundred one thousand, five hundred twenty".