489728657 has 4 divisors (see below), whose sum is σ = 534249456. Its totient is φ = 445207860.

The previous prime is 489728647. The next prime is 489728683. The reversal of 489728657 is 756827984.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 489728657 - 2¹⁸ = 489466513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (489728647) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 22260383 + ... + 22260404.

It is an arithmetic number, because the mean of its divisors is an integer number (133562364).

Almost surely, 2^489728657 is an apocalyptic number.

It is an amenable number.

489728657 is a deficient number, since it is larger than the sum of its proper divisors (44520799).

489728657 is a wasteful number, since it uses less digits than its factorization.

489728657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44520798.

The product of its digits is 6773760, while the sum is 56.

The square root of 489728657 is about 22129.8137588187. The cubic root of 489728657 is about 788.2279658792.

The spelling of 489728657 in words is "four hundred eighty-nine million, seven hundred twenty-eight thousand, six hundred fifty-seven".