664444244 has 12 divisors (see below), whose sum is σ = 1163131284. Its totient is φ = 332121024.

The previous prime is 664444223. The next prime is 664444247. The reversal of 664444244 is 442444466.

It can be written as a sum of positive squares in 2 ways, for example, as 603291844 + 61152400 = 24562^2 + 7820^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664444198 and 664444207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664444247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9377 + ... + 37640.

It is an arithmetic number, because the mean of its divisors is an integer number (96927607).

Almost surely, 2^664444244 is an apocalyptic number.

It is an amenable number.

664444244 is a deficient number, since it is larger than the sum of its proper divisors (498687040).

664444244 is a wasteful number, since it uses less digits than its factorization.

664444244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50554 (or 50552 counting only the distinct ones).

The product of its digits is 294912, while the sum is 38.

The square root of 664444244 is about 25776.8160174991. The cubic root of 664444244 is about 872.6086515321.

The spelling of 664444244 in words is "six hundred sixty-four million, four hundred forty-four thousand, two hundred forty-four".