3638128487 has 8 divisors (see below), whose sum is σ = 4190601216. Its totient is φ = 3093840792.

The previous prime is 3638128457. The next prime is 3638128499. The reversal of 3638128487 is 7848218363.

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

It is not a de Polignac number, because 3638128487 - 2²⁶ = 3571019623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638128447) 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, 2045303 + ... + 2047080.

It is an arithmetic number, because the mean of its divisors is an integer number (523825152).

Almost surely, 2^3638128487 is an apocalyptic number.

3638128487 is a deficient number, since it is larger than the sum of its proper divisors (552472729).

3638128487 is a wasteful number, since it uses less digits than its factorization.

3638128487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092517.

The product of its digits is 1548288, while the sum is 50.

The square root of 3638128487 is about 60316.9005088955. The cubic root of 3638128487 is about 1538.0106554310.

The spelling of 3638128487 in words is "three billion, six hundred thirty-eight million, one hundred twenty-eight thousand, four hundred eighty-seven".