491856870 has 64 divisors (see below), whose sum is σ = 1198540800. Its totient is φ = 129168000.

The previous prime is 491856797. The next prime is 491856877. The reversal of 491856870 is 78658194.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491856877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 820831 + ... + 821429.

It is an arithmetic number, because the mean of its divisors is an integer number (18727200).

Almost surely, 2^491856870 is an apocalyptic number.

491856870 is an abundant number, since it is smaller than the sum of its proper divisors (706683930).

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

491856870 is a wasteful number, since it uses less digits than its factorization.

491856870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981.

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 491856870 is about 22177.8463787627. The cubic root of 491856870 is about 789.3681162023.

The spelling of 491856870 in words is "four hundred ninety-one million, eight hundred fifty-six thousand, eight hundred seventy".