491409968 has 40 divisors (see below), whose sum is σ = 1090742688. Its totient is φ = 210097152.

The previous prime is 491409943. The next prime is 491409979. The reversal of 491409968 is 869904194.

It is a happy number.

It is a super-3 number, since 3×491409968³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43430 + ... + 53562.

Almost surely, 2^491409968 is an apocalyptic number.

It is an amenable number.

491409968 is an abundant number, since it is smaller than the sum of its proper divisors (599332720).

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

491409968 is a wasteful number, since it uses less digits than its factorization.

491409968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10581 (or 10575 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 491409968 is about 22167.7686743614. The cubic root of 491409968 is about 789.1289700144.

The spelling of 491409968 in words is "four hundred ninety-one million, four hundred nine thousand, nine hundred sixty-eight".