6620615220 has 96 divisors (see below), whose sum is σ = 19025798400. Its totient is φ = 1719178240.

The previous prime is 6620615219. The next prime is 6620615249. The reversal of 6620615220 is 225160266.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1471294 + ... + 1475786.

It is an arithmetic number, because the mean of its divisors is an integer number (198185400).

Almost surely, 2^6620615220 is an apocalyptic number.

6620615220 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 6620615220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9512899200).

6620615220 is an abundant number, since it is smaller than the sum of its proper divisors (12405183180).

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

6620615220 is a wasteful number, since it uses less digits than its factorization.

6620615220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5145 (or 5143 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 6620615220 is about 81367.1630327616. The cubic root of 6620615220 is about 1877.7284337981.

Adding to 6620615220 its reverse (225160266), we get a palindrome (6845775486).

The spelling of 6620615220 in words is "six billion, six hundred twenty million, six hundred fifteen thousand, two hundred twenty".