644082946 has 8 divisors (see below), whose sum is σ = 1040441724. Its totient is φ = 297269040.

The previous prime is 644082941. The next prime is 644082947. The reversal of 644082946 is 649280446.

It can be written as a sum of positive squares in 2 ways, for example, as 511257321 + 132825625 = 22611^2 + 11525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (644082941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12386185 + ... + 12386236.

Almost surely, 2^644082946 is an apocalyptic number.

644082946 is a deficient number, since it is larger than the sum of its proper divisors (396358778).

644082946 is a wasteful number, since it uses less digits than its factorization.

644082946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24772436.

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 644082946 is about 25378.7892934238. The cubic root of 644082946 is about 863.6025844678.

The spelling of 644082946 in words is "six hundred forty-four million, eighty-two thousand, nine hundred forty-six".