491478440 has 32 divisors (see below), whose sum is σ = 1107530280. Its totient is φ = 196288512.

The previous prime is 491478431. The next prime is 491478451. The reversal of 491478440 is 44874194.

It can be written as a sum of positive squares in 4 ways, for example, as 310252996 + 181225444 = 17614^2 + 13462^2 .

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, 17792 + ... + 36048.

Almost surely, 2^491478440 is an apocalyptic number.

491478440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491478440 is an abundant number, since it is smaller than the sum of its proper divisors (616051840).

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

491478440 is a wasteful number, since it uses less digits than its factorization.

491478440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18941 (or 18937 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 491478440 is about 22169.3130249902. The cubic root of 491478440 is about 789.1656201523.

The spelling of 491478440 in words is "four hundred ninety-one million, four hundred seventy-eight thousand, four hundred forty".