6689520 has 160 divisors (see below), whose sum is σ = 24403200. Its totient is φ = 1679616.

The previous prime is 6689503. The next prime is 6689537. The reversal of 6689520 is 259866.

It is an interprime number because it is at equal distance from previous prime (6689503) and next prime (6689537).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40959 + ... + 41121.

It is an arithmetic number, because the mean of its divisors is an integer number (152520).

Almost surely, 2^6689520 is an apocalyptic number.

6689520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6689520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12201600).

6689520 is an abundant number, since it is smaller than the sum of its proper divisors (17713680).

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

6689520 is a wasteful number, since it uses less digits than its factorization.

6689520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 6689520 is about 2586.4106402503. The cubic root of 6689520 is about 188.4220186039.

The spelling of 6689520 in words is "six million, six hundred eighty-nine thousand, five hundred twenty".