647642227 has 16 divisors (see below), whose sum is σ = 689817600. Its totient is φ = 606324960.

The previous prime is 647642207. The next prime is 647642243. The reversal of 647642227 is 722246746.

It is a de Polignac number, because none of the positive numbers 2^k-647642227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647642227.

It is not an unprimeable number, because it can be changed into a prime (647642207) 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, 649093 + ... + 650089.

It is an arithmetic number, because the mean of its divisors is an integer number (43113600).

Almost surely, 2^647642227 is an apocalyptic number.

647642227 is a deficient number, since it is larger than the sum of its proper divisors (42175373).

647642227 is a wasteful number, since it uses less digits than its factorization.

647642227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386.

The product of its digits is 225792, while the sum is 40.

The square root of 647642227 is about 25448.8158270675. The cubic root of 647642227 is about 865.1904542373.

The spelling of 647642227 in words is "six hundred forty-seven million, six hundred forty-two thousand, two hundred twenty-seven".