644127346 has 16 divisors (see below), whose sum is σ = 976649400. Its totient is φ = 318588928.

The previous prime is 644127329. The next prime is 644127349. The reversal of 644127346 is 643721446.

It can be written as a sum of positive squares in 4 ways, for example, as 238548025 + 405579321 = 15445^2 + 20139^2 .

It is not an unprimeable number, because it can be changed into a prime (644127349) 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, 126090 + ... + 131098.

Almost surely, 2^644127346 is an apocalyptic number.

644127346 is a deficient number, since it is larger than the sum of its proper divisors (332522054).

644127346 is a wasteful number, since it uses less digits than its factorization.

644127346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5693.

The product of its digits is 96768, while the sum is 37.

The square root of 644127346 is about 25379.6640245690. The cubic root of 644127346 is about 863.6224282234.

The spelling of 644127346 in words is "six hundred forty-four million, one hundred twenty-seven thousand, three hundred forty-six".