664440044 has 12 divisors (see below), whose sum is σ = 1167193104. Its totient is φ = 330956304.

The previous prime is 664440041. The next prime is 664440047. The reversal of 664440044 is 440044466.

It is an interprime number because it is at equal distance from previous prime (664440041) and next prime (664440047).

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (664440041) 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, 314747 + ... + 316850.

It is an arithmetic number, because the mean of its divisors is an integer number (97266092).

Almost surely, 2^664440044 is an apocalyptic number.

It is an amenable number.

664440044 is a deficient number, since it is larger than the sum of its proper divisors (502753060).

664440044 is a wasteful number, since it uses less digits than its factorization.

664440044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631864 (or 631862 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

The square root of 664440044 is about 25776.7345488136. The cubic root of 664440044 is about 872.6068129208.

The spelling of 664440044 in words is "six hundred sixty-four million, four hundred forty thousand, forty-four".