664795456 has 56 divisors (see below), whose sum is σ = 1424818080. Its totient is φ = 305935872.

The previous prime is 664795441. The next prime is 664795459. The reversal of 664795456 is 654597466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664795459) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 347655 + ... + 349561.

It is an arithmetic number, because the mean of its divisors is an integer number (25443180).

Almost surely, 2^664795456 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 664795456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712409040).

664795456 is an abundant number, since it is smaller than the sum of its proper divisors (760022624).

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

664795456 is a wasteful number, since it uses less digits than its factorization.

664795456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351 (or 2341 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 52.

The square root of 664795456 is about 25783.6276733899. The cubic root of 664795456 is about 872.7623723047.

The spelling of 664795456 in words is "six hundred sixty-four million, seven hundred ninety-five thousand, four hundred fifty-six".