491283840 has 64 divisors (see below), whose sum is σ = 1565973360. Its totient is φ = 131008512.

The previous prime is 491283839. The next prime is 491283883. The reversal of 491283840 is 48382194.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×491283840² = 482719622890291200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126019 + ... + 129858.

Almost surely, 2^491283840 is an apocalyptic number.

491283840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491283840 is an abundant number, since it is smaller than the sum of its proper divisors (1074689520).

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

491283840 is a wasteful number, since it uses less digits than its factorization.

491283840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255899 (or 255887 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 491283840 is about 22164.9236407437. The cubic root of 491283840 is about 789.0614501688.

The spelling of 491283840 in words is "four hundred ninety-one million, two hundred eighty-three thousand, eight hundred forty".