644110242 has 16 divisors (see below), whose sum is σ = 1332642240. Its totient is φ = 207299792.

The previous prime is 644110223. The next prime is 644110249. The reversal of 644110242 is 242011446.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (644110249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1850718 + ... + 1851065.

It is an arithmetic number, because the mean of its divisors is an integer number (83290140).

Almost surely, 2^644110242 is an apocalyptic number.

644110242 is an abundant number, since it is smaller than the sum of its proper divisors (688531998).

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

644110242 is a wasteful number, since it uses less digits than its factorization.

644110242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3701817.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 644110242 is about 25379.3270596365. The cubic root of 644110242 is about 863.6147840162.

Adding to 644110242 its reverse (242011446), we get a palindrome (886121688).

The spelling of 644110242 in words is "six hundred forty-four million, one hundred ten thousand, two hundred forty-two".