3639808641 has 32 divisors (see below), whose sum is σ = 5668864000. Its totient is φ = 2076474960.

The previous prime is 3639808607. The next prime is 3639808691. The reversal of 3639808641 is 1468089363.

It is not a de Polignac number, because 3639808641 - 2⁶ = 3639808577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3639808691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 708480 + ... + 713598.

It is an arithmetic number, because the mean of its divisors is an integer number (177152000).

Almost surely, 2^3639808641 is an apocalyptic number.

It is an amenable number.

3639808641 is a deficient number, since it is larger than the sum of its proper divisors (2029055359).

3639808641 is an equidigital number, since it uses as much as digits as its factorization.

3639808641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5834 (or 5820 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 3639808641 is about 60330.8266228799. The cubic root of 3639808641 is about 1538.2473794383.

The spelling of 3639808641 in words is "three billion, six hundred thirty-nine million, eight hundred eight thousand, six hundred forty-one".