3218368720 has 80 divisors (see below), whose sum is σ = 8569951488. Its totient is φ = 1101081600.

The previous prime is 3218368711. The next prime is 3218368793. The reversal of 3218368720 is 278638123.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266820 + ... + 278620.

Almost surely, 2^3218368720 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 3218368720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4284975744).

3218368720 is an abundant number, since it is smaller than the sum of its proper divisors (5351582768).

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

3218368720 is a wasteful number, since it uses less digits than its factorization.

3218368720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12308 (or 12302 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 3218368720 is about 56730.6682491930. The cubic root of 3218368720 is about 1476.4268441341.

The spelling of 3218368720 in words is "three billion, two hundred eighteen million, three hundred sixty-eight thousand, seven hundred twenty".