3220278720 has 224 divisors, whose sum is σ = 11120493888. Its totient is φ = 786235392.

The previous prime is 3220278679. The next prime is 3220278731. The reversal of 3220278720 is 278720223.

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, 601174 + ... + 606506.

It is an arithmetic number, because the mean of its divisors is an integer number (49645062).

Almost surely, 2^3220278720 is an apocalyptic number.

3220278720 is a gapful number since it is divisible by the number (30) 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 3220278720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5560246944).

3220278720 is an abundant number, since it is smaller than the sum of its proper divisors (7900215168).

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

3220278720 is a wasteful number, since it uses less digits than its factorization.

3220278720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407 (or 5397 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 3220278720 is about 56747.4996806027. The cubic root of 3220278720 is about 1476.7188572465.

Adding to 3220278720 its reverse (278720223), we get a palindrome (3498998943).

The spelling of 3220278720 in words is "three billion, two hundred twenty million, two hundred seventy-eight thousand, seven hundred twenty".