644325254 has 4 divisors (see below), whose sum is σ = 966487884. Its totient is φ = 322162626.

The previous prime is 644325233. The next prime is 644325257. The reversal of 644325254 is 452523446.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644325257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161081312 + ... + 161081315.

It is an arithmetic number, because the mean of its divisors is an integer number (241621971).

Almost surely, 2^644325254 is an apocalyptic number.

644325254 is a deficient number, since it is larger than the sum of its proper divisors (322162630).

644325254 is a wasteful number, since it uses less digits than its factorization.

644325254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322162629.

The product of its digits is 115200, while the sum is 35.

The square root of 644325254 is about 25383.5626735098. The cubic root of 644325254 is about 863.7108684398.

The spelling of 644325254 in words is "six hundred forty-four million, three hundred twenty-five thousand, two hundred fifty-four".