3681221388 has 24 divisors (see below), whose sum is σ = 9250249008. Its totient is φ = 1132683456.

The previous prime is 3681221377. The next prime is 3681221393. The reversal of 3681221388 is 8831221863.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11798631 + ... + 11798942.

It is an arithmetic number, because the mean of its divisors is an integer number (385427042).

Almost surely, 2^3681221388 is an apocalyptic number.

It is an amenable number.

3681221388 is an abundant number, since it is smaller than the sum of its proper divisors (5569027620).

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

3681221388 is a wasteful number, since it uses less digits than its factorization.

3681221388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23597593 (or 23597591 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 3681221388 is about 60673.0697097155. The cubic root of 3681221388 is about 1544.0593119537.

The spelling of 3681221388 in words is "three billion, six hundred eighty-one million, two hundred twenty-one thousand, three hundred eighty-eight".