728749947827 has 4 divisors (see below), whose sum is σ = 794999943096. Its totient is φ = 662499952560.

The previous prime is 728749947671. The next prime is 728749947839.

728749947827 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728749947827 - 2¹⁸ = 728749685683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728749941827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33124997618 + ... + 33124997639.

It is an arithmetic number, because the mean of its divisors is an integer number (198749985774).

Almost surely, 2^728749947827 is an apocalyptic number.

728749947827 is a deficient number, since it is larger than the sum of its proper divisors (66249995269).

728749947827 is a wasteful number, since it uses less digits than its factorization.

728749947827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66249995268.

The product of its digits is 796594176, while the sum is 74.

The spelling of 728749947827 in words is "seven hundred twenty-eight billion, seven hundred forty-nine million, nine hundred forty-seven thousand, eight hundred twenty-seven".