664647458 has 8 divisors (see below), whose sum is σ = 998445852. Its totient is φ = 331832176.

The previous prime is 664647457. The next prime is 664647481. The reversal of 664647458 is 854746466.

It can be written as a sum of positive squares in 2 ways, for example, as 653671489 + 10975969 = 25567^2 + 3313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (664647457) 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 3 ways as a sum of consecutive naturals, for example, 244085 + ... + 246792.

Almost surely, 2^664647458 is an apocalyptic number.

664647458 is a deficient number, since it is larger than the sum of its proper divisors (333798394).

664647458 is a wasteful number, since it uses less digits than its factorization.

664647458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491556.

The product of its digits is 3870720, while the sum is 50.

The square root of 664647458 is about 25780.7575140840. The cubic root of 664647458 is about 872.6976021709.

The spelling of 664647458 in words is "six hundred sixty-four million, six hundred forty-seven thousand, four hundred fifty-eight".