6619979520 has 864 divisors, whose sum is σ = 30304834560. Its totient is φ = 1291714560.

The previous prime is 6619979507. The next prime is 6619979539. The reversal of 6619979520 is 259799166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15079461 + ... + 15079899.

It is an arithmetic number, because the mean of its divisors is an integer number (35075040).

Almost surely, 2^6619979520 is an apocalyptic number.

6619979520 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 6619979520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15152417280).

6619979520 is an abundant number, since it is smaller than the sum of its proper divisors (23684855040).

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

6619979520 is a wasteful number, since it uses less digits than its factorization.

6619979520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 54.

The square root of 6619979520 is about 81363.2565719932. The cubic root of 6619979520 is about 1877.6683331311.

The spelling of 6619979520 in words is "six billion, six hundred nineteen million, nine hundred seventy-nine thousand, five hundred twenty".