664728479 has 4 divisors (see below), whose sum is σ = 666482760. Its totient is φ = 662974200.

The previous prime is 664728469. The next prime is 664728481. The reversal of 664728479 is 974827466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 974827466 = 2 ⋅487413733.

It is a cyclic number.

It is not a de Polignac number, because 664728479 - 2⁸ = 664728223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664728479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664728409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876572 + ... + 877329.

It is an arithmetic number, because the mean of its divisors is an integer number (166620690).

Almost surely, 2^664728479 is an apocalyptic number.

664728479 is a deficient number, since it is larger than the sum of its proper divisors (1754281).

664728479 is a wasteful number, since it uses less digits than its factorization.

664728479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754280.

The product of its digits is 4064256, while the sum is 53.

The square root of 664728479 is about 25782.3288125801. The cubic root of 664728479 is about 872.7330615505.

The spelling of 664728479 in words is "six hundred sixty-four million, seven hundred twenty-eight thousand, four hundred seventy-nine".