489956778 has 12 divisors (see below), whose sum is σ = 1061573058. Its totient is φ = 163318920.

The previous prime is 489956777. The next prime is 489956821. The reversal of 489956778 is 877659984.

489956778 is a `hidden beast` number, since 489 + 95 + 67 + 7 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 479478609 + 10478169 = 21897^2 + 3237^2 .

It is not an unprimeable number, because it can be changed into a prime (489956771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13609893 + ... + 13609928.

Almost surely, 2^489956778 is an apocalyptic number.

489956778 is an abundant number, since it is smaller than the sum of its proper divisors (571616280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

489956778 is a wasteful number, since it uses less digits than its factorization.

489956778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27219829 (or 27219826 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The square root of 489956778 is about 22134.9673141841. The cubic root of 489956778 is about 788.3503353023.

The spelling of 489956778 in words is "four hundred eighty-nine million, nine hundred fifty-six thousand, seven hundred seventy-eight".