646472223 has 12 divisors (see below), whose sum is σ = 939979248. Its totient is φ = 428126400.

The previous prime is 646472219. The next prime is 646472227. The reversal of 646472223 is 322274646.

646472223 is a `hidden beast` number, since 6 + 4 + 647 + 2 + 2 + 2 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (646472219) and next prime (646472227).

It is not a de Polignac number, because 646472223 - 2² = 646472219 is a prime.

It is a super-3 number, since 3×646472223³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646472227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236490 + ... + 239207.

It is an arithmetic number, because the mean of its divisors is an integer number (78331604).

Almost surely, 2^646472223 is an apocalyptic number.

646472223 is a deficient number, since it is larger than the sum of its proper divisors (293507025).

646472223 is a wasteful number, since it uses less digits than its factorization.

646472223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475854 (or 475851 counting only the distinct ones).

The product of its digits is 96768, while the sum is 36.

The square root of 646472223 is about 25425.8180399373. The cubic root of 646472223 is about 864.6691342649.

It can be divided in two parts, 6464 and 72223, that added together give a palindrome (78687).

The spelling of 646472223 in words is "six hundred forty-six million, four hundred seventy-two thousand, two hundred twenty-three".