644202309064 has 32 divisors (see below), whose sum is σ = 1240893894240. Its totient is φ = 313356960000.

The previous prime is 644202309031. The next prime is 644202309209. The reversal of 644202309064 is 460903202446.

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, 3644097 + ... + 3816784.

It is an arithmetic number, because the mean of its divisors is an integer number (38777934195).

Almost surely, 2^644202309064 is an apocalyptic number.

It is an amenable number.

644202309064 is a deficient number, since it is larger than the sum of its proper divisors (596691585176).

644202309064 is a wasteful number, since it uses less digits than its factorization.

644202309064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461181 (or 7461177 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 644202309064 in words is "six hundred forty-four billion, two hundred two million, three hundred nine thousand, sixty-four".