646223473 has 8 divisors (see below), whose sum is σ = 742668480. Its totient is φ = 550810320.

The previous prime is 646223467. The next prime is 646223477. The reversal of 646223473 is 374322646.

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

It is a cyclic number.

It is not a de Polignac number, because 646223473 - 2⁵ = 646223441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646223477) 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 7 ways as a sum of consecutive naturals, for example, 256618 + ... + 259123.

It is an arithmetic number, because the mean of its divisors is an integer number (92833560).

Almost surely, 2^646223473 is an apocalyptic number.

It is an amenable number.

646223473 is a deficient number, since it is larger than the sum of its proper divisors (96445007).

646223473 is a wasteful number, since it uses less digits than its factorization.

646223473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515927.

The product of its digits is 145152, while the sum is 37.

The square root of 646223473 is about 25420.9258879373. The cubic root of 646223473 is about 864.5582173879.

The spelling of 646223473 in words is "six hundred forty-six million, two hundred twenty-three thousand, four hundred seventy-three".