491644168 has 16 divisors (see below), whose sum is σ = 937458000. Its totient is φ = 241655376.

The previous prime is 491644157. The next prime is 491644187. The reversal of 491644168 is 861446194.

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, 520338 + ... + 521281.

It is an arithmetic number, because the mean of its divisors is an integer number (58591125).

Almost surely, 2^491644168 is an apocalyptic number.

It is an amenable number.

491644168 is a deficient number, since it is larger than the sum of its proper divisors (445813832).

491644168 is a wasteful number, since it uses less digits than its factorization.

491644168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041684 (or 1041680 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 491644168 is about 22173.0504892764. The cubic root of 491644168 is about 789.2543131864.

The spelling of 491644168 in words is "four hundred ninety-one million, six hundred forty-four thousand, one hundred sixty-eight".