6620981760 has 480 divisors, whose sum is σ = 24183327168. Its totient is φ = 1672151040.

The previous prime is 6620981753. The next prime is 6620981771. The reversal of 6620981760 is 671890266.

6620981760 is a `hidden beast` number, since 6 + 620 + 9 + 8 + 17 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40619439 + ... + 40619601.

Almost surely, 2^6620981760 is an apocalyptic number.

6620981760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6620981760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12091663584).

6620981760 is an abundant number, since it is smaller than the sum of its proper divisors (17562345408).

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

6620981760 is a wasteful number, since it uses less digits than its factorization.

6620981760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 6620981760 is about 81369.4153844060. The cubic root of 6620981760 is about 1877.7630856573.

The spelling of 6620981760 in words is "six billion, six hundred twenty million, nine hundred eighty-one thousand, seven hundred sixty".