3213981636 has 96 divisors (see below), whose sum is σ = 8188121088. Its totient is φ = 978320640.

The previous prime is 3213981629. The next prime is 3213981647. The reversal of 3213981636 is 6361893123.

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 31 ways as a sum of consecutive naturals, for example, 528831 + ... + 534873.

It is an arithmetic number, because the mean of its divisors is an integer number (85292928).

Almost surely, 2^3213981636 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 3213981636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4094060544).

3213981636 is an abundant number, since it is smaller than the sum of its proper divisors (4974139452).

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

3213981636 is a wasteful number, since it uses less digits than its factorization.

3213981636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6161 (or 6159 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 3213981636 is about 56691.9891695467. The cubic root of 3213981636 is about 1475.7556807289.

The spelling of 3213981636 in words is "three billion, two hundred thirteen million, nine hundred eighty-one thousand, six hundred thirty-six".