6988644 has 72 divisors (see below), whose sum is σ = 19339320. Its totient is φ = 2115072.

The previous prime is 6988643. The next prime is 6988669. The reversal of 6988644 is 4468896.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 788544 + 6200100 = 888^2 + 2490^2 .

It is a super-2 number, since 2×6988644² = 97682289917472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6988644.

It is not an unprimeable number, because it can be changed into a prime (6988643) 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 23 ways as a sum of consecutive naturals, for example, 50944 + ... + 51080.

Almost surely, 2^6988644 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 6988644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9669660).

6988644 is an abundant number, since it is smaller than the sum of its proper divisors (12350676).

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

6988644 is a wasteful number, since it uses less digits than its factorization.

6988644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 264 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 6988644 is about 2643.6043576905. The cubic root of 6988644 is about 191.1896182572.

The spelling of 6988644 in words is "six million, nine hundred eighty-eight thousand, six hundred forty-four".