644425030 has 16 divisors (see below), whose sum is σ = 1161214704. Its totient is φ = 257492320.

The previous prime is 644425027. The next prime is 644425043. The reversal of 644425030 is 30524446.

It is a self number, because there is not a number n which added to its sum of digits gives 644425030.

It is a congruent number.

It is an unprimeable number.

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, 24832 + ... + 43651.

It is an arithmetic number, because the mean of its divisors is an integer number (72575919).

Almost surely, 2^644425030 is an apocalyptic number.

644425030 is a deficient number, since it is larger than the sum of its proper divisors (516789674).

644425030 is a wasteful number, since it uses less digits than its factorization.

644425030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69431.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 644425030 is about 25385.5279637828. The cubic root of 644425030 is about 863.7554490132.

Adding to 644425030 its reverse (30524446), we get a palindrome (674949476).

The spelling of 644425030 in words is "six hundred forty-four million, four hundred twenty-five thousand, thirty".