491928816 has 20 divisors (see below), whose sum is σ = 1270816232. Its totient is φ = 163976256.

The previous prime is 491928803. The next prime is 491928821. The reversal of 491928816 is 618829194.

It is a super-2 number, since 2×491928816² = 483987920022323712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 10248517 = 491928816 / (4 + 9 + 1 + 9 + 2 + 8 + 8 + 1 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124211 + ... + 5124306.

Almost surely, 2^491928816 is an apocalyptic number.

It is an amenable number.

491928816 is an abundant number, since it is smaller than the sum of its proper divisors (778887416).

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

491928816 is a wasteful number, since it uses less digits than its factorization.

491928816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10248528 (or 10248522 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 491928816 is about 22179.4683434928. The cubic root of 491928816 is about 789.4066024050.

The spelling of 491928816 in words is "four hundred ninety-one million, nine hundred twenty-eight thousand, eight hundred sixteen".