644316410 has 24 divisors (see below), whose sum is σ = 1224029556. Its totient is φ = 244160640.

The previous prime is 644316401. The next prime is 644316433. The reversal of 644316410 is 14613446.

It can be written as a sum of positive squares in 2 ways, for example, as 641456929 + 2859481 = 25327^2 + 1691^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85631 + ... + 92850.

Almost surely, 2^644316410 is an apocalyptic number.

644316410 is a deficient number, since it is larger than the sum of its proper divisors (579713146).

644316410 is a wasteful number, since it uses less digits than its factorization.

644316410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178526 (or 178507 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 644316410 is about 25383.3884656876. The cubic root of 644316410 is about 863.7069166604.

Adding to 644316410 its reverse (14613446), we get a palindrome (658929856).

The spelling of 644316410 in words is "six hundred forty-four million, three hundred sixteen thousand, four hundred ten".