646144733 has 8 divisors (see below), whose sum is σ = 696560088. Its totient is φ = 595831104.

The previous prime is 646144669. The next prime is 646144739. The reversal of 646144733 is 337441646.

It is a happy number.

646144733 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 4 ways, for example, as 29019769 + 617124964 = 5387^2 + 24842^2 .

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 646144733 - 2⁶ = 646144669 is a prime.

It is a super-3 number, since 3×646144733³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646144739) 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, 11966 + ... + 37887.

It is an arithmetic number, because the mean of its divisors is an integer number (87070011).

Almost surely, 2^646144733 is an apocalyptic number.

It is an amenable number.

646144733 is a deficient number, since it is larger than the sum of its proper divisors (50415355).

646144733 is a wasteful number, since it uses less digits than its factorization.

646144733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50863.

The product of its digits is 145152, while the sum is 38.

The square root of 646144733 is about 25419.3771166801. The cubic root of 646144733 is about 864.5231015278.

The spelling of 646144733 in words is "six hundred forty-six million, one hundred forty-four thousand, seven hundred thirty-three".