3218287840 has 24 divisors (see below), whose sum is σ = 7603205400. Its totient is φ = 1287315072.

The previous prime is 3218287819. The next prime is 3218287841. The reversal of 3218287840 is 487828123.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3218287841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10056990 + ... + 10057309.

It is an arithmetic number, because the mean of its divisors is an integer number (316800225).

Almost surely, 2^3218287840 is an apocalyptic number.

It is an amenable number.

3218287840 is an abundant number, since it is smaller than the sum of its proper divisors (4384917560).

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

3218287840 is a wasteful number, since it uses less digits than its factorization.

3218287840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20114314 (or 20114306 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 3218287840 is about 56729.9554027676. The cubic root of 3218287840 is about 1476.4144761288.

The spelling of 3218287840 in words is "three billion, two hundred eighteen million, two hundred eighty-seven thousand, eight hundred forty".