489635978 has 16 divisors (see below), whose sum is σ = 791327880. Its totient is φ = 225878016.

The previous prime is 489635963. The next prime is 489635987. The reversal of 489635978 is 879536984.

It can be written as a sum of positive squares in 4 ways, for example, as 200873929 + 288762049 = 14173^2 + 16993^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 83726 + ... + 89382.

Almost surely, 2^489635978 is an apocalyptic number.

489635978 is a deficient number, since it is larger than the sum of its proper divisors (301691902).

489635978 is a wasteful number, since it uses less digits than its factorization.

489635978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001.

The product of its digits is 13063680, while the sum is 59.

The square root of 489635978 is about 22127.7196746524. The cubic root of 489635978 is about 788.1782398474.

The spelling of 489635978 in words is "four hundred eighty-nine million, six hundred thirty-five thousand, nine hundred seventy-eight".