491812980 has 24 divisors (see below), whose sum is σ = 1377076512. Its totient is φ = 131150112.

The previous prime is 491812963. The next prime is 491813027. The reversal of 491812980 is 89218194.

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, 4098382 + ... + 4098501.

It is an arithmetic number, because the mean of its divisors is an integer number (57378188).

Almost surely, 2^491812980 is an apocalyptic number.

It is an amenable number.

491812980 is an abundant number, since it is smaller than the sum of its proper divisors (885263532).

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

491812980 is a wasteful number, since it uses less digits than its factorization.

491812980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8196895 (or 8196893 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 491812980 is about 22176.8568557404. The cubic root of 491812980 is about 789.3446362028.

The spelling of 491812980 in words is "four hundred ninety-one million, eight hundred twelve thousand, nine hundred eighty".