664468464 has 80 divisors (see below), whose sum is σ = 1876129920. Its totient is φ = 200974080.

The previous prime is 664468463. The next prime is 664468471. The reversal of 664468464 is 464864466.

It is a Harshad number since it is a multiple of its sum of digits (48).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664468463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420027 + ... + 421605.

It is an arithmetic number, because the mean of its divisors is an integer number (23451624).

Almost surely, 2^664468464 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 664468464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938064960).

664468464 is an abundant number, since it is smaller than the sum of its proper divisors (1211661456).

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

664468464 is a wasteful number, since it uses less digits than its factorization.

664468464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398 (or 2392 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 48.

The square root of 664468464 is about 25777.2858152289. The cubic root of 664468464 is about 872.6192540394.

The spelling of 664468464 in words is "six hundred sixty-four million, four hundred sixty-eight thousand, four hundred sixty-four".