3643406631 has 12 divisors (see below), whose sum is σ = 5264370280. Its totient is φ = 2428166160.

The previous prime is 3643406623. The next prime is 3643406647. The reversal of 3643406631 is 1366043463.

3643406631 is a `hidden beast` number, since 3 + 643 + 4 + 0 + 6 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 3643406631 - 2³ = 3643406623 is a prime.

It is a super-2 number, since 2×3643406631² = 26548823757629540322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643406531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33625 + ... + 91746.

Almost surely, 2^3643406631 is an apocalyptic number.

3643406631 is a deficient number, since it is larger than the sum of its proper divisors (1620963649).

3643406631 is a wasteful number, since it uses less digits than its factorization.

3643406631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128606 (or 128603 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The square root of 3643406631 is about 60360.6380930487. The cubic root of 3643406631 is about 1538.7540705462.

The spelling of 3643406631 in words is "three billion, six hundred forty-three million, four hundred six thousand, six hundred thirty-one".