491808872 has 24 divisors (see below), whose sum is σ = 931842450. Its totient is φ = 243324000.

The previous prime is 491808871. The next prime is 491808907. The reversal of 491808872 is 278808194.

It can be written as a sum of positive squares in only one way, i.e., 381264676 + 110544196 = 19526^2 + 10514^2 .

It is not an unprimeable number, because it can be changed into a prime (491808871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654497 + ... + 655247.

Almost surely, 2^491808872 is an apocalyptic number.

It is an amenable number.

491808872 is a deficient number, since it is larger than the sum of its proper divisors (440033578).

491808872 is an equidigital number, since it uses as much as digits as its factorization.

491808872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 491808872 is about 22176.7642364706. The cubic root of 491808872 is about 789.3424384590.

The spelling of 491808872 in words is "four hundred ninety-one million, eight hundred eight thousand, eight hundred seventy-two".