6620227720 has 64 divisors (see below), whose sum is σ = 15784502400. Its totient is φ = 2490301440.

The previous prime is 6620227717. The next prime is 6620227727. The reversal of 6620227720 is 277220266.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (6620227727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1037901 + ... + 1044259.

It is an arithmetic number, because the mean of its divisors is an integer number (246632850).

Almost surely, 2^6620227720 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 6620227720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7892251200).

6620227720 is an abundant number, since it is smaller than the sum of its proper divisors (9164274680).

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

6620227720 is a wasteful number, since it uses less digits than its factorization.

6620227720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7918 (or 7914 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 6620227720 is about 81364.7818162133. The cubic root of 6620227720 is about 1877.6917990373.

Adding to 6620227720 its reverse (277220266), we get a palindrome (6897447986).

The spelling of 6620227720 in words is "six billion, six hundred twenty million, two hundred twenty-seven thousand, seven hundred twenty".