664133478 has 16 divisors (see below), whose sum is σ = 1328762880. Its totient is φ = 221295176.

The previous prime is 664133473. The next prime is 664133507. The reversal of 664133478 is 874331466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664133473) 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 7 ways as a sum of consecutive naturals, for example, 1950 + ... + 36497.

It is an arithmetic number, because the mean of its divisors is an integer number (83047680).

Almost surely, 2^664133478 is an apocalyptic number.

664133478 is an abundant number, since it is smaller than the sum of its proper divisors (664629402).

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

664133478 is a wasteful number, since it uses less digits than its factorization.

664133478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41331.

The product of its digits is 290304, while the sum is 42.

The square root of 664133478 is about 25770.7872988002. The cubic root of 664133478 is about 872.4725882527.

The spelling of 664133478 in words is "six hundred sixty-four million, one hundred thirty-three thousand, four hundred seventy-eight".