647636223 has 24 divisors (see below), whose sum is σ = 984276480. Its totient is φ = 377563680.

The previous prime is 647636219. The next prime is 647636239. The reversal of 647636223 is 322636746.

It is not a de Polignac number, because 647636223 - 2² = 647636219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647636243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23983 + ... + 43248.

It is an arithmetic number, because the mean of its divisors is an integer number (41011520).

Almost surely, 2^647636223 is an apocalyptic number.

647636223 is a deficient number, since it is larger than the sum of its proper divisors (336640257).

647636223 is a wasteful number, since it uses less digits than its factorization.

647636223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67279 (or 67266 counting only the distinct ones).

The product of its digits is 217728, while the sum is 39.

The square root of 647636223 is about 25448.6978645274. The cubic root of 647636223 is about 865.1877806318.

The spelling of 647636223 in words is "six hundred forty-seven million, six hundred thirty-six thousand, two hundred twenty-three".