6688620 has 36 divisors (see below), whose sum is σ = 20289360. Its totient is φ = 1783584.

The previous prime is 6688603. The next prime is 6688631. The reversal of 6688620 is 268866.

6688620 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18400 + ... + 18759.

Almost surely, 2^6688620 is an apocalyptic number.

6688620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6688620 is an abundant number, since it is smaller than the sum of its proper divisors (13600740).

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

6688620 is a wasteful number, since it uses less digits than its factorization.

6688620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37174 (or 37169 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 6688620 is about 2586.2366481047. The cubic root of 6688620 is about 188.4135682007.

The spelling of 6688620 in words is "six million, six hundred eighty-eight thousand, six hundred twenty".