664001024 has 20 divisors (see below), whose sum is σ = 1326706194. Its totient is φ = 332000256.

The previous prime is 664000979. The next prime is 664001047. The reversal of 664001024 is 420100466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 651270400 + 12730624 = 25520^2 + 3568^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647927 + ... + 648950.

Almost surely, 2^664001024 is an apocalyptic number.

664001024 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664001024 is a deficient number, since it is larger than the sum of its proper divisors (662705170).

664001024 is an equidigital number, since it uses as much as digits as its factorization.

664001024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296895 (or 1296879 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 664001024 is about 25768.2173228960. The cubic root of 664001024 is about 872.4145827607.

The spelling of 664001024 in words is "six hundred sixty-four million, one thousand, twenty-four".