3631221640 has 64 divisors (see below), whose sum is σ = 8270262000. Its totient is φ = 1434792960.

The previous prime is 3631221541. The next prime is 3631221647. The reversal of 3631221640 is 461221363.

It can be written as a sum of positive squares in 8 ways, for example, as 2440557604 + 1190664036 = 49402^2 + 34506^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3631221599 and 3631221608.

It is not an unprimeable number, because it can be changed into a prime (3631221647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1694970 + ... + 1697110.

Almost surely, 2^3631221640 is an apocalyptic number.

It is an amenable number.

3631221640 is an abundant number, since it is smaller than the sum of its proper divisors (4639040360).

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

3631221640 is a wasteful number, since it uses less digits than its factorization.

3631221640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650 (or 2646 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 3631221640 is about 60259.6186512991. The cubic root of 3631221640 is about 1537.0367541750.

The spelling of 3631221640 in words is "three billion, six hundred thirty-one million, two hundred twenty-one thousand, six hundred forty".