644006060 has 12 divisors (see below), whose sum is σ = 1352412768. Its totient is φ = 257602416.

The previous prime is 644006057. The next prime is 644006081. The reversal of 644006060 is 60600446.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16100132 + ... + 16100171.

It is an arithmetic number, because the mean of its divisors is an integer number (112701064).

Almost surely, 2^644006060 is an apocalyptic number.

It is an amenable number.

644006060 is an abundant number, since it is smaller than the sum of its proper divisors (708406708).

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

644006060 is a wasteful number, since it uses less digits than its factorization.

644006060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32200312 (or 32200310 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 644006060 is about 25377.2744793447. The cubic root of 644006060 is about 863.5682195406.

The spelling of 644006060 in words is "six hundred forty-four million, six thousand, sixty".