491686880 has 48 divisors (see below), whose sum is σ = 1201677120. Its totient is φ = 189891072.

The previous prime is 491686873. The next prime is 491686913. The reversal of 491686880 is 88686194.

It is a happy number.

It is a congruent number.

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, 48344 + ... + 57623.

It is an arithmetic number, because the mean of its divisors is an integer number (25034940).

Almost surely, 2^491686880 is an apocalyptic number.

491686880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491686880 is an abundant number, since it is smaller than the sum of its proper divisors (709990240).

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

491686880 is a wasteful number, since it uses less digits than its factorization.

491686880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106011 (or 106003 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 491686880 is about 22174.0136195503. The cubic root of 491686880 is about 789.2771682350.

The spelling of 491686880 in words is "four hundred ninety-one million, six hundred eighty-six thousand, eight hundred eighty".