647640222 has 8 divisors (see below), whose sum is σ = 1295280456. Its totient is φ = 215880072.

The previous prime is 647640221. The next prime is 647640247. The reversal of 647640222 is 222046746.

647640222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

647640222 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647640221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53970013 + ... + 53970024.

It is an arithmetic number, because the mean of its divisors is an integer number (161910057).

Almost surely, 2^647640222 is an apocalyptic number.

647640222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647640222 is a wasteful number, since it uses less digits than its factorization.

647640222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107940042.

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 647640222 is about 25448.7764342414. The cubic root of 647640222 is about 865.1895614045.

Adding to 647640222 its reverse (222046746), we get a palindrome (869686968).

The spelling of 647640222 in words is "six hundred forty-seven million, six hundred forty thousand, two hundred twenty-two".