644530010 has 64 divisors (see below), whose sum is σ = 1291479552. Its totient is φ = 230501376.

The previous prime is 644530001. The next prime is 644530013. The reversal of 644530010 is 10035446.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (644530013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269279 + ... + 271661.

It is an arithmetic number, because the mean of its divisors is an integer number (20179368).

Almost surely, 2^644530010 is an apocalyptic number.

644530010 is an abundant number, since it is smaller than the sum of its proper divisors (646949542).

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

644530010 is a wasteful number, since it uses less digits than its factorization.

644530010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 644530010 is about 25387.5955931238. The cubic root of 644530010 is about 863.8023498003.

Adding to 644530010 its reverse (10035446), we get a palindrome (654565456).

The spelling of 644530010 in words is "six hundred forty-four million, five hundred thirty thousand, ten".