6628720 has 120 divisors (see below), whose sum is σ = 19083600. Its totient is φ = 2128896.

The previous prime is 6628717. The next prime is 6628723. The reversal of 6628720 is 278266.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6628717) and next prime (6628723).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6628723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74436 + ... + 74524.

It is an arithmetic number, because the mean of its divisors is an integer number (159030).

Almost surely, 2^6628720 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 6628720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9541800).

6628720 is an abundant number, since it is smaller than the sum of its proper divisors (12454880).

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

6628720 is a wasteful number, since it uses less digits than its factorization.

6628720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 6628720 is about 2574.6300705150. The cubic root of 6628720 is about 187.8494342983.

The spelling of 6628720 in words is "six million, six hundred twenty-eight thousand, seven hundred twenty".