638575089 has 16 divisors (see below), whose sum is σ = 867620160. Its totient is φ = 417697280.

The previous prime is 638575079. The next prime is 638575109. The reversal of 638575089 is 980575836.

It is a cyclic number.

It is not a de Polignac number, because 638575089 - 2¹¹ = 638573041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638575039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25849 + ... + 44105.

It is an arithmetic number, because the mean of its divisors is an integer number (54226260).

Almost surely, 2^638575089 is an apocalyptic number.

It is an amenable number.

638575089 is a deficient number, since it is larger than the sum of its proper divisors (229045071).

638575089 is a wasteful number, since it uses less digits than its factorization.

638575089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18480.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The square root of 638575089 is about 25270.0433121908. The cubic root of 638575089 is about 861.1338429308.

The spelling of 638575089 in words is "six hundred thirty-eight million, five hundred seventy-five thousand, eighty-nine".