664740747 has 24 divisors (see below), whose sum is σ = 1050095280. Its totient is φ = 401863680.

The previous prime is 664740731. The next prime is 664740757. The reversal of 664740747 is 747047466.

It is not a de Polignac number, because 664740747 - 2⁴ = 664740731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664740757) 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 23 ways as a sum of consecutive naturals, for example, 32283 + ... + 48699.

It is an arithmetic number, because the mean of its divisors is an integer number (43753970).

Almost surely, 2^664740747 is an apocalyptic number.

664740747 is a deficient number, since it is larger than the sum of its proper divisors (385354533).

664740747 is a wasteful number, since it uses less digits than its factorization.

664740747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16843 (or 16840 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 45.

The square root of 664740747 is about 25782.5667263754. The cubic root of 664740747 is about 872.7384304711.

The spelling of 664740747 in words is "six hundred sixty-four million, seven hundred forty thousand, seven hundred forty-seven".