491634864 has 60 divisors (see below), whose sum is σ = 1572454416. Its totient is φ = 140466816.

The previous prime is 491634851. The next prime is 491634881. The reversal of 491634864 is 468436194.

491634864 is a `hidden beast` number, since 4 + 9 + 1 + 634 + 8 + 6 + 4 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242859 + ... + 244874.

Almost surely, 2^491634864 is an apocalyptic number.

It is an amenable number.

491634864 is an abundant number, since it is smaller than the sum of its proper divisors (1080819552).

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

491634864 is a wasteful number, since it uses less digits than its factorization.

491634864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487754 (or 487745 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 491634864 is about 22172.8406840441. The cubic root of 491634864 is about 789.2493344715.

The spelling of 491634864 in words is "four hundred ninety-one million, six hundred thirty-four thousand, eight hundred sixty-four".