3639650128 has 20 divisors (see below), whose sum is σ = 7082094708. Its totient is φ = 1812012800.

The previous prime is 3639650117. The next prime is 3639650129. The reversal of 3639650128 is 8210569363.

It can be written as a sum of positive squares in 2 ways, for example, as 1130842384 + 2508807744 = 33628^2 + 50088^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639650129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484423 + ... + 491878.

Almost surely, 2^3639650128 is an apocalyptic number.

It is an amenable number.

3639650128 is a deficient number, since it is larger than the sum of its proper divisors (3442444580).

3639650128 is a wasteful number, since it uses less digits than its factorization.

3639650128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976542 (or 976536 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 3639650128 is about 60329.5129103493. The cubic root of 3639650128 is about 1538.2250489835.

The spelling of 3639650128 in words is "three billion, six hundred thirty-nine million, six hundred fifty thousand, one hundred twenty-eight".