491178840 has 64 divisors (see below), whose sum is σ = 1483349760. Its totient is φ = 130108800.

The previous prime is 491178827. The next prime is 491178851. The reversal of 491178840 is 48871194.

It is a junction number, because it is equal to n+sod(n) for n = 491178792 and 491178801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4567 + ... + 31673.

It is an arithmetic number, because the mean of its divisors is an integer number (23177340).

Almost surely, 2^491178840 is an apocalyptic number.

491178840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491178840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741674880).

491178840 is an abundant number, since it is smaller than the sum of its proper divisors (992170920).

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

491178840 is a wasteful number, since it uses less digits than its factorization.

491178840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27272 (or 27268 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 491178840 is about 22162.5549068694. The cubic root of 491178840 is about 789.0052319173.

The spelling of 491178840 in words is "four hundred ninety-one million, one hundred seventy-eight thousand, eight hundred forty".