491656768 has 28 divisors (see below), whose sum is σ = 1026982960. Its totient is φ = 232889472.

The previous prime is 491656747. The next prime is 491656793. The reversal of 491656768 is 867656194.

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, 200946 + ... + 203377.

Almost surely, 2^491656768 is an apocalyptic number.

It is an amenable number.

491656768 is an abundant number, since it is smaller than the sum of its proper divisors (535326192).

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

491656768 is a wasteful number, since it uses less digits than its factorization.

491656768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404354 (or 404344 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The square root of 491656768 is about 22173.3346161555. The cubic root of 491656768 is about 789.2610555420.

The spelling of 491656768 in words is "four hundred ninety-one million, six hundred fifty-six thousand, seven hundred sixty-eight".