644264237704 has 16 divisors (see below), whose sum is σ = 1208046628800. Its totient is φ = 322118470032.

The previous prime is 644264237693. The next prime is 644264237717. The reversal of 644264237704 is 407732462446.

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, 1504084 + ... + 1884355.

It is an arithmetic number, because the mean of its divisors is an integer number (75502914300).

Almost surely, 2^644264237704 is an apocalyptic number.

It is an amenable number.

644264237704 is a deficient number, since it is larger than the sum of its proper divisors (563782391096).

644264237704 is a wasteful number, since it uses less digits than its factorization.

644264237704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3412212 (or 3412208 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 49.

The spelling of 644264237704 in words is "six hundred forty-four billion, two hundred sixty-four million, two hundred thirty-seven thousand, seven hundred four".