297728720 has 40 divisors (see below), whose sum is σ = 693337320. Its totient is φ = 118899200.

The previous prime is 297728647. The next prime is 297728723. The reversal of 297728720 is 27827792.

It can be written as a sum of positive squares in 4 ways, for example, as 7639696 + 290089024 = 2764^2 + 17032^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (297728723) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 53426 + ... + 58734.

It is an arithmetic number, because the mean of its divisors is an integer number (17333433).

Almost surely, 2^297728720 is an apocalyptic number.

297728720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

297728720 is an abundant number, since it is smaller than the sum of its proper divisors (395608600).

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

297728720 is a wasteful number, since it uses less digits than its factorization.

297728720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023 (or 6017 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 297728720 is about 17254.8172983663. The cubic root of 297728720 is about 667.7392578412.

The spelling of 297728720 in words is "two hundred ninety-seven million, seven hundred twenty-eight thousand, seven hundred twenty".