646217332 has 12 divisors (see below), whose sum is σ = 1134086436. Its totient is φ = 322192640.

The previous prime is 646217323. The next prime is 646217371. The reversal of 646217332 is 233712646.

646217332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 217975696 + 428241636 = 14764^2 + 20694^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227419 + ... + 230242.

It is an arithmetic number, because the mean of its divisors is an integer number (94507203).

Almost surely, 2^646217332 is an apocalyptic number.

It is an amenable number.

646217332 is a deficient number, since it is larger than the sum of its proper divisors (487869104).

646217332 is a wasteful number, since it uses less digits than its factorization.

646217332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458018 (or 458016 counting only the distinct ones).

The product of its digits is 36288, while the sum is 34.

The square root of 646217332 is about 25420.8051013338. The cubic root of 646217332 is about 864.5554787745. Note that the first 3 decimals are identical.

Adding to 646217332 its reverse (233712646), we get a palindrome (879929978).

The spelling of 646217332 in words is "six hundred forty-six million, two hundred seventeen thousand, three hundred thirty-two".