644424614 has 16 divisors (see below), whose sum is σ = 998308800. Its totient is φ = 311809344.

The previous prime is 644424581. The next prime is 644424629. The reversal of 644424614 is 416424446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30149 + ... + 46880.

It is an arithmetic number, because the mean of its divisors is an integer number (62394300).

Almost surely, 2^644424614 is an apocalyptic number.

644424614 is a deficient number, since it is larger than the sum of its proper divisors (353884186).

644424614 is a wasteful number, since it uses less digits than its factorization.

644424614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77167.

The product of its digits is 73728, while the sum is 35.

The square root of 644424614 is about 25385.5197701367. The cubic root of 644424614 is about 863.7552631512.

The spelling of 644424614 in words is "six hundred forty-four million, four hundred twenty-four thousand, six hundred fourteen".