491878220 has 12 divisors (see below), whose sum is σ = 1032944304. Its totient is φ = 196751280.

The previous prime is 491878199. The next prime is 491878237. The reversal of 491878220 is 22878194.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 12296936 + ... + 12296975.

It is an arithmetic number, because the mean of its divisors is an integer number (86078692).

Almost surely, 2^491878220 is an apocalyptic number.

It is an amenable number.

491878220 is an abundant number, since it is smaller than the sum of its proper divisors (541066084).

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

491878220 is a wasteful number, since it uses less digits than its factorization.

491878220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24593920 (or 24593918 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 491878220 is about 22178.3277097260. The cubic root of 491878220 is about 789.3795373876.

It can be divided in two parts, 4918 and 78220, that added together give a palindrome (83138).

The spelling of 491878220 in words is "four hundred ninety-one million, eight hundred seventy-eight thousand, two hundred twenty".