728747591 has 8 divisors (see below), whose sum is σ = 856151184. Its totient is φ = 611536320.

The previous prime is 728747563. The next prime is 728747651. The reversal of 728747591 is 195747827.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728747591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728747521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2547926 + ... + 2548211.

It is an arithmetic number, because the mean of its divisors is an integer number (107018898).

Almost surely, 2^728747591 is an apocalyptic number.

728747591 is a deficient number, since it is larger than the sum of its proper divisors (127403593).

728747591 is a wasteful number, since it uses less digits than its factorization.

728747591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096161.

The product of its digits is 987840, while the sum is 50.

The square root of 728747591 is about 26995.3253545869. The cubic root of 728747591 is about 899.8961159930.

The spelling of 728747591 in words is "seven hundred twenty-eight million, seven hundred forty-seven thousand, five hundred ninety-one".