6620921088 has 72 divisors (see below), whose sum is σ = 17739876000. Its totient is φ = 2192123904.

The previous prime is 6620921071. The next prime is 6620921093. The reversal of 6620921088 is 8801290266.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 85503 + ... + 143361.

Almost surely, 2^6620921088 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 6620921088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8869938000).

6620921088 is an abundant number, since it is smaller than the sum of its proper divisors (11118954912).

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

6620921088 is a wasteful number, since it uses less digits than its factorization.

6620921088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58027 (or 58013 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 6620921088 is about 81369.0425653393. The cubic root of 6620921088 is about 1877.7573499525.

The spelling of 6620921088 in words is "six billion, six hundred twenty million, nine hundred twenty-one thousand, eighty-eight".