3561640636 has 24 divisors (see below), whose sum is σ = 6513534720. Its totient is φ = 1702393392.

The previous prime is 3561640631. The next prime is 3561640729. The reversal of 3561640636 is 6360461653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561640631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212206 + ... + 228373.

It is an arithmetic number, because the mean of its divisors is an integer number (271397280).

Almost surely, 2^3561640636 is an apocalyptic number.

It is an amenable number.

3561640636 is a deficient number, since it is larger than the sum of its proper divisors (2951894084).

3561640636 is a wasteful number, since it uses less digits than its factorization.

3561640636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440673 (or 440671 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 3561640636 is about 59679.4825379711. The cubic root of 3561640636 is about 1527.1558702717.

The spelling of 3561640636 in words is "three billion, five hundred sixty-one million, six hundred forty thousand, six hundred thirty-six".