6699520 has 40 divisors (see below), whose sum is σ = 16069284. Its totient is φ = 2678784.

The previous prime is 6699491. The next prime is 6699541. The reversal of 6699520 is 259966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6310144 + 389376 = 2512^2 + 624^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 6699520.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252 + ... + 3868.

Almost surely, 2^6699520 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 6699520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8034642).

6699520 is an abundant number, since it is smaller than the sum of its proper divisors (9369764).

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

6699520 is an equidigital number, since it uses as much as digits as its factorization.

6699520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640 (or 2624 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 6699520 is about 2588.3430993591. The cubic root of 6699520 is about 188.5158610158.

It can be divided in two parts, 6699 and 520, that multiplied together give a triangular number (3483480 = T₂₆₃₉).

The spelling of 6699520 in words is "six million, six hundred ninety-nine thousand, five hundred twenty".