644911050 has 72 divisors (see below), whose sum is σ = 1860523776. Its totient is φ = 147406560.

The previous prime is 644911039. The next prime is 644911051. The reversal of 644911050 is 50119446.

It is a happy number.

644911050 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 644910999 and 644911017.

It is not an unprimeable number, because it can be changed into a prime (644911051) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 36522 + ... + 51221.

It is an arithmetic number, because the mean of its divisors is an integer number (25840608).

Almost surely, 2^644911050 is an apocalyptic number.

644911050 is an abundant number, since it is smaller than the sum of its proper divisors (1215612726).

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

644911050 is a wasteful number, since it uses less digits than its factorization.

644911050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87772 (or 87760 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 644911050 is about 25395.0989366059. The cubic root of 644911050 is about 863.9725401724.

The spelling of 644911050 in words is "six hundred forty-four million, nine hundred eleven thousand, fifty".