491447720 has 32 divisors (see below), whose sum is σ = 1123890120. Its totient is φ = 193355520.

The previous prime is 491447707. The next prime is 491447741. The reversal of 491447720 is 27744194.

It can be written as a sum of positive squares in 4 ways, for example, as 316626436 + 174821284 = 17794^2 + 13222^2 .

It is a super-2 number, since 2×491447720² = 483041722986396800, which contains 22 as substring.

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, 98267 + ... + 103146.

Almost surely, 2^491447720 is an apocalyptic number.

491447720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491447720 is an abundant number, since it is smaller than the sum of its proper divisors (632442400).

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

491447720 is a wasteful number, since it uses less digits than its factorization.

491447720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201485 (or 201481 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 491447720 is about 22168.6201645479. The cubic root of 491447720 is about 789.1491774691.

The spelling of 491447720 in words is "four hundred ninety-one million, four hundred forty-seven thousand, seven hundred twenty".