664487829 has 12 divisors (see below), whose sum is σ = 972964876. Its totient is φ = 436923072.

The previous prime is 664487777. The next prime is 664487839. The reversal of 664487829 is 928784466.

It can be written as a sum of positive squares in 2 ways, for example, as 325080900 + 339406929 = 18030^2 + 18423^2 .

It is not a de Polignac number, because 664487829 - 2¹¹ = 664485781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664487839) 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 11 ways as a sum of consecutive naturals, for example, 505042 + ... + 506355.

Almost surely, 2^664487829 is an apocalyptic number.

It is an amenable number.

664487829 is a deficient number, since it is larger than the sum of its proper divisors (308477047).

664487829 is a wasteful number, since it uses less digits than its factorization.

664487829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011476 (or 1011473 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 664487829 is about 25777.6614338850. The cubic root of 664487829 is about 872.6277310445.

The spelling of 664487829 in words is "six hundred sixty-four million, four hundred eighty-seven thousand, eight hundred twenty-nine".