647118873 has 6 divisors (see below), whose sum is σ = 934727274. Its totient is φ = 431412576.

The previous prime is 647118859. The next prime is 647118877. The reversal of 647118873 is 378811746.

It can be written as a sum of positive squares in only one way, i.e., 643535424 + 3583449 = 25368^2 + 1893^2 .

It is not a de Polignac number, because 647118873 - 2⁵ = 647118841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647118877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35951040 + ... + 35951057.

It is an arithmetic number, because the mean of its divisors is an integer number (155787879).

Almost surely, 2^647118873 is an apocalyptic number.

It is an amenable number.

647118873 is a deficient number, since it is larger than the sum of its proper divisors (287608401).

647118873 is a wasteful number, since it uses less digits than its factorization.

647118873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71902103 (or 71902100 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 647118873 is about 25438.5312665649. The cubic root of 647118873 is about 864.9573404959.

The spelling of 647118873 in words is "six hundred forty-seven million, one hundred eighteen thousand, eight hundred seventy-three".