639089569 has 8 divisors (see below), whose sum is σ = 667440000. Its totient is φ = 610786176.

The previous prime is 639089557. The next prime is 639089573. The reversal of 639089569 is 965980936.

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 639089569 - 2²¹ = 636992417 is a prime.

It is a super-2 number, since 2×639089569² = 816870954409211522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639089599) 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, 17604 + ... + 39850.

It is an arithmetic number, because the mean of its divisors is an integer number (83430000).

Almost surely, 2^639089569 is an apocalyptic number.

It is an amenable number.

639089569 is a deficient number, since it is larger than the sum of its proper divisors (28350431).

639089569 is a wasteful number, since it uses less digits than its factorization.

639089569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23519.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The square root of 639089569 is about 25280.2209048893. The cubic root of 639089569 is about 861.3650437299.

It can be divided in two parts, 6390 and 89569, that added together give a palindrome (95959).

The spelling of 639089569 in words is "six hundred thirty-nine million, eighty-nine thousand, five hundred sixty-nine".