647847889 has 8 divisors (see below), whose sum is σ = 720188672. Its totient is φ = 578722320.

The previous prime is 647847887. The next prime is 647848007. The reversal of 647847889 is 988748746.

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 647847889 - 2¹ = 647847887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647847881) 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, 803379 + ... + 804184.

It is an arithmetic number, because the mean of its divisors is an integer number (90023584).

Almost surely, 2^647847889 is an apocalyptic number.

It is an amenable number.

647847889 is a deficient number, since it is larger than the sum of its proper divisors (72340783).

647847889 is a wasteful number, since it uses less digits than its factorization.

647847889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607607.

The product of its digits is 21676032, while the sum is 61.

The square root of 647847889 is about 25452.8562051492. The cubic root of 647847889 is about 865.2820263843.

The spelling of 647847889 in words is "six hundred forty-seven million, eight hundred forty-seven thousand, eight hundred eighty-nine".