491087440 has 20 divisors (see below), whose sum is σ = 1141778484. Its totient is φ = 196434944.

The previous prime is 491087437. The next prime is 491087473. The reversal of 491087440 is 44780194.

It can be written as a sum of positive squares in 2 ways, for example, as 192765456 + 298321984 = 13884^2 + 17272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 491087440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3069217 + ... + 3069376.

Almost surely, 2^491087440 is an apocalyptic number.

491087440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491087440 is an abundant number, since it is smaller than the sum of its proper divisors (650691044).

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

491087440 is a wasteful number, since it uses less digits than its factorization.

491087440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6138606 (or 6138600 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 491087440 is about 22160.4927743045. The cubic root of 491087440 is about 788.9562887450.

The spelling of 491087440 in words is "four hundred ninety-one million, eighty-seven thousand, four hundred forty".