3216644388 has 72 divisors (see below), whose sum is σ = 8439238080. Its totient is φ = 1031808960.

The previous prime is 3216644377. The next prime is 3216644393. The reversal of 3216644388 is 8834466123.

It is a super-2 number, since 2×3216644388² = 20693602237703789088, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 319731 + ... + 329637.

It is an arithmetic number, because the mean of its divisors is an integer number (117211640).

Almost surely, 2^3216644388 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 3216644388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4219619040).

3216644388 is an abundant number, since it is smaller than the sum of its proper divisors (5222593692).

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

3216644388 is a wasteful number, since it uses less digits than its factorization.

3216644388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10257 (or 10252 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 3216644388 is about 56715.4686835964. The cubic root of 3216644388 is about 1476.1631178926.

The spelling of 3216644388 in words is "three billion, two hundred sixteen million, six hundred forty-four thousand, three hundred eighty-eight".