3638646805 has 8 divisors (see below), whose sum is σ = 4556218752. Its totient is φ = 2784355728.

The previous prime is 3638646763. The next prime is 3638646839. The reversal of 3638646805 is 5086468363.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3638646805 - 2²⁹ = 3101775893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15820089 + ... + 15820318.

It is an arithmetic number, because the mean of its divisors is an integer number (569527344).

Almost surely, 2^3638646805 is an apocalyptic number.

It is an amenable number.

3638646805 is a deficient number, since it is larger than the sum of its proper divisors (917571947).

3638646805 is a wasteful number, since it uses less digits than its factorization.

3638646805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31640435.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The square root of 3638646805 is about 60321.1969791714. The cubic root of 3638646805 is about 1538.0836912199.

The spelling of 3638646805 in words is "three billion, six hundred thirty-eight million, six hundred forty-six thousand, eight hundred five".