3221812640 has 48 divisors (see below), whose sum is σ = 7857077760. Its totient is φ = 1247151360.

The previous prime is 3221812637. The next prime is 3221812667. The reversal of 3221812640 is 462181223.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319820 + ... + 329739.

It is an arithmetic number, because the mean of its divisors is an integer number (163689120).

Almost surely, 2^3221812640 is an apocalyptic number.

It is an amenable number.

3221812640 is an abundant number, since it is smaller than the sum of its proper divisors (4635265120).

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

3221812640 is a wasteful number, since it uses less digits than its factorization.

3221812640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649605 (or 649597 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 3221812640 is about 56761.0133806647. The cubic root of 3221812640 is about 1476.9532892346.

Adding to 3221812640 its reverse (462181223), we get a palindrome (3683993863).

The spelling of 3221812640 in words is "three billion, two hundred twenty-one million, eight hundred twelve thousand, six hundred forty".