644025116 has 24 divisors (see below), whose sum is σ = 1344053760. Its totient is φ = 264010032.

The previous prime is 644025103. The next prime is 644025131. The reversal of 644025116 is 611520446.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

644025116 is a modest number, since divided by 25116 gives 644 as remainder.

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, 499376 + ... + 500663.

It is an arithmetic number, because the mean of its divisors is an integer number (56002240).

Almost surely, 2^644025116 is an apocalyptic number.

It is an amenable number.

644025116 is an abundant number, since it is smaller than the sum of its proper divisors (700028644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644025116 is a wasteful number, since it uses less digits than its factorization.

644025116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000073 (or 1000071 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 644025116 is about 25377.6499305984. The cubic root of 644025116 is about 863.5767370556.

The spelling of 644025116 in words is "six hundred forty-four million, twenty-five thousand, one hundred sixteen".