6636720 has 40 divisors (see below), whose sum is σ = 20574576. Its totient is φ = 1769728.

The previous prime is 6636709. The next prime is 6636767. The reversal of 6636720 is 276366.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13587 + ... + 14066.

Almost surely, 2^6636720 is an apocalyptic number.

6636720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6636720 is an abundant number, since it is smaller than the sum of its proper divisors (13937856).

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

6636720 is a wasteful number, since it uses less digits than its factorization.

6636720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27669 (or 27663 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 6636720 is about 2576.1832232976. The cubic root of 6636720 is about 187.9249738353.

The spelling of 6636720 in words is "six million, six hundred thirty-six thousand, seven hundred twenty".