489628681 has 4 divisors (see below), whose sum is σ = 498867012. Its totient is φ = 480390352.

The previous prime is 489628673. The next prime is 489628693. The reversal of 489628681 is 186826984.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 338560000 + 151068681 = 18400^2 + 12291^2 .

It is a cyclic number.

It is not a de Polignac number, because 489628681 - 2³ = 489628673 is a prime.

It is a super-2 number, since 2×489628681² = 479472490515599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (489628621) 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, 4619086 + ... + 4619191.

It is an arithmetic number, because the mean of its divisors is an integer number (124716753).

Almost surely, 2^489628681 is an apocalyptic number.

It is an amenable number.

489628681 is a deficient number, since it is larger than the sum of its proper divisors (9238331).

489628681 is an equidigital number, since it uses as much as digits as its factorization.

489628681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9238330.

The product of its digits is 1327104, while the sum is 52.

The square root of 489628681 is about 22127.5547903513. The cubic root of 489628681 is about 788.1743244453.

The spelling of 489628681 in words is "four hundred eighty-nine million, six hundred twenty-eight thousand, six hundred eighty-one".