6720670656 has 896 divisors, whose sum is σ = 26334720000. Its totient is φ = 1669054464.

The previous prime is 6720670601. The next prime is 6720670657. The reversal of 6720670656 is 6560760276.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720670657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 231747250 + ... + 231747278.

Almost surely, 2^6720670656 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 6720670656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13167360000).

6720670656 is an abundant number, since it is smaller than the sum of its proper divisors (19614049344).

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

6720670656 is a wasteful number, since it uses less digits than its factorization.

6720670656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 6720670656 is about 81979.6966083676. The cubic root of 6720670656 is about 1887.1403668196.

The spelling of 6720670656 in words is "six billion, seven hundred twenty million, six hundred seventy thousand, six hundred fifty-six".