491724720 has 60 divisors (see below), whose sum is σ = 1651377936. Its totient is φ = 131126400.

The previous prime is 491724713. The next prime is 491724757. The reversal of 491724720 is 27427194.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340756 + ... + 342195.

Almost surely, 2^491724720 is an apocalyptic number.

491724720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491724720 is an abundant number, since it is smaller than the sum of its proper divisors (1159653216).

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

491724720 is a wasteful number, since it uses less digits than its factorization.

491724720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682970 (or 682961 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 491724720 is about 22174.8668541662. The cubic root of 491724720 is about 789.2974151870.

The spelling of 491724720 in words is "four hundred ninety-one million, seven hundred twenty-four thousand, seven hundred twenty".