646222647 has 8 divisors (see below), whose sum is σ = 984720256. Its totient is φ = 369270072.

The previous prime is 646222637. The next prime is 646222669. The reversal of 646222647 is 746222646.

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

It is not a de Polignac number, because 646222647 - 2⁸ = 646222391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646222637) 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, 15386233 + ... + 15386274.

It is an arithmetic number, because the mean of its divisors is an integer number (123090032).

Almost surely, 2^646222647 is an apocalyptic number.

646222647 is a deficient number, since it is larger than the sum of its proper divisors (338497609).

646222647 is a wasteful number, since it uses less digits than its factorization.

646222647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30772517.

The product of its digits is 193536, while the sum is 39.

The square root of 646222647 is about 25420.9096414743. The cubic root of 646222647 is about 864.5578490296.

Subtracting 646222647 from its reverse (746222646), we obtain a palindrome (99999999).

The spelling of 646222647 in words is "six hundred forty-six million, two hundred twenty-two thousand, six hundred forty-seven".