6620978672 has 120 divisors (see below), whose sum is σ = 16161236448. Its totient is φ = 2572162560.

The previous prime is 6620978671. The next prime is 6620978687. The reversal of 6620978672 is 2768790266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620978671) 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, 8306978 + ... + 8307774.

Almost surely, 2^6620978672 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 6620978672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8080618224).

6620978672 is an abundant number, since it is smaller than the sum of its proper divisors (9540257776).

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

6620978672 is a wasteful number, since it uses less digits than its factorization.

6620978672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1430 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 53.

The square root of 6620978672 is about 81369.3964092152. The cubic root of 6620978672 is about 1877.7627937301.

The spelling of 6620978672 in words is "six billion, six hundred twenty million, nine hundred seventy-eight thousand, six hundred seventy-two".