4405643636 has 12 divisors (see below), whose sum is σ = 8163398628. Its totient is φ = 2073244032.

The previous prime is 4405643611. The next prime is 4405643657. The reversal of 4405643636 is 6363465044.

It can be written as a sum of positive squares in 2 ways, for example, as 3058753636 + 1346890000 = 55306^2 + 36700^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4405643593 and 4405643602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32394371 + ... + 32394506.

It is an arithmetic number, because the mean of its divisors is an integer number (680283219).

Almost surely, 2^4405643636 is an apocalyptic number.

It is an amenable number.

4405643636 is a deficient number, since it is larger than the sum of its proper divisors (3757754992).

4405643636 is a wasteful number, since it uses less digits than its factorization.

4405643636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64788898 (or 64788896 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 41.

The square root of 4405643636 is about 66375.0226817287. The cubic root of 4405643636 is about 1639.3428405140.

The spelling of 4405643636 in words is "four billion, four hundred five million, six hundred forty-three thousand, six hundred thirty-six".