664464816 has 80 divisors (see below), whose sum is σ = 1943313120. Its totient is φ = 217301760.

The previous prime is 664464809. The next prime is 664464821. The reversal of 664464816 is 618464466.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8386 + ... + 37406.

It is an arithmetic number, because the mean of its divisors is an integer number (24291414).

Almost surely, 2^664464816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664464816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971656560).

664464816 is an abundant number, since it is smaller than the sum of its proper divisors (1278848304).

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

664464816 is a wasteful number, since it uses less digits than its factorization.

664464816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29091 (or 29079 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 664464816 is about 25777.2150551606. The cubic root of 664464816 is about 872.6176571134.

The spelling of 664464816 in words is "six hundred sixty-four million, four hundred sixty-four thousand, eight hundred sixteen".