647536889 has 8 divisors (see below), whose sum is σ = 665358720. Its totient is φ = 629732016.

The previous prime is 647536873. The next prime is 647536927. The reversal of 647536889 is 988635746.

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 647536889 - 2⁴ = 647536873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647536189) 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, 132992 + ... + 137774.

It is an arithmetic number, because the mean of its divisors is an integer number (83169840).

Almost surely, 2^647536889 is an apocalyptic number.

It is an amenable number.

647536889 is a deficient number, since it is larger than the sum of its proper divisors (17821831).

647536889 is a wasteful number, since it uses less digits than its factorization.

647536889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8479.

The product of its digits is 8709120, while the sum is 56.

The square root of 647536889 is about 25446.7461377678. The cubic root of 647536889 is about 865.1435444005.

The spelling of 647536889 in words is "six hundred forty-seven million, five hundred thirty-six thousand, eight hundred eighty-nine".