3621981132 has 144 divisors (see below), whose sum is σ = 11476168704. Its totient is φ = 935712000.

The previous prime is 3621981107. The next prime is 3621981133. The reversal of 3621981132 is 2311891263.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (3621981133) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 526032 + ... + 532872.

It is an arithmetic number, because the mean of its divisors is an integer number (79695616).

Almost surely, 2^3621981132 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 3621981132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5738084352).

3621981132 is an abundant number, since it is smaller than the sum of its proper divisors (7854187572).

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

3621981132 is a wasteful number, since it uses less digits than its factorization.

3621981132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060 (or 7055 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 3621981132 is about 60182.8973380312. The cubic root of 3621981132 is about 1535.7318613563.

The spelling of 3621981132 in words is "three billion, six hundred twenty-one million, nine hundred eighty-one thousand, one hundred thirty-two".