491888784 has 20 divisors (see below), whose sum is σ = 1270712816. Its totient is φ = 163962912.

The previous prime is 491888779. The next prime is 491888791. The reversal of 491888784 is 487888194.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5123794 + ... + 5123889.

Almost surely, 2^491888784 is an apocalyptic number.

It is an amenable number.

491888784 is an abundant number, since it is smaller than the sum of its proper divisors (778824032).

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

491888784 is a wasteful number, since it uses less digits than its factorization.

491888784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247694 (or 10247688 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 57.

The square root of 491888784 is about 22178.5658688744. The cubic root of 491888784 is about 789.3851884786.

The spelling of 491888784 in words is "four hundred ninety-one million, eight hundred eighty-eight thousand, seven hundred eighty-four".