644530007 has 4 divisors (see below), whose sum is σ = 703123656. Its totient is φ = 585936360.

The previous prime is 644530001. The next prime is 644530013. The reversal of 644530007 is 700035446.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (644530001) and next prime (644530013).

It is a cyclic number.

It is not a de Polignac number, because 644530007 - 2¹² = 644525911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644530001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29296808 + ... + 29296829.

It is an arithmetic number, because the mean of its divisors is an integer number (175780914).

Almost surely, 2^644530007 is an apocalyptic number.

644530007 is a deficient number, since it is larger than the sum of its proper divisors (58593649).

644530007 is a wasteful number, since it uses less digits than its factorization.

644530007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58593648.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 644530007 is about 25387.5955340398. The cubic root of 644530007 is about 863.8023484601.

The spelling of 644530007 in words is "six hundred forty-four million, five hundred thirty thousand, seven".