3220720704 has 210 divisors, whose sum is σ = 10082012094. Its totient is φ = 1016478720.

The previous prime is 3220720691. The next prime is 3220720709. The reversal of 3220720704 is 4070270223.

3220720704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2994278400 + 226442304 = 54720^2 + 15048^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (3220720709) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1870564 + ... + 1872284.

Almost surely, 2^3220720704 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 3220720704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5041006047).

3220720704 is an abundant number, since it is smaller than the sum of its proper divisors (6861291390).

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

3220720704 is a wasteful number, since it uses less digits than its factorization.

3220720704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1745 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 3220720704 is about 56751.3938507241. The cubic root of 3220720704 is about 1476.7864141576.

Adding to 3220720704 its reverse (4070270223), we get a palindrome (7290990927).

The spelling of 3220720704 in words is "three billion, two hundred twenty million, seven hundred twenty thousand, seven hundred four".