646044481 has 8 divisors (see below), whose sum is σ = 654546600. Its totient is φ = 637598208.

The previous prime is 646044467. The next prime is 646044551. The reversal of 646044481 is 184440646.

It can be written as a sum of positive squares in 4 ways, for example, as 60840000 + 585204481 = 7800^2 + 24191^2 .

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 646044481 - 2⁵ = 646044449 is a prime.

It is a super-2 number, since 2×646044481² = 834746942861118722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646044481.

It is not an unprimeable number, because it can be changed into a prime (646044781) 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, 9585 + ... + 37201.

It is an arithmetic number, because the mean of its divisors is an integer number (81818325).

Almost surely, 2^646044481 is an apocalyptic number.

It is an amenable number.

646044481 is a deficient number, since it is larger than the sum of its proper divisors (8502119).

646044481 is a wasteful number, since it uses less digits than its factorization.

646044481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27923.

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 646044481 is about 25417.4050799841. The cubic root of 646044481 is about 864.4783877827.

The spelling of 646044481 in words is "six hundred forty-six million, forty-four thousand, four hundred eighty-one".