728231784531 has 4 divisors (see below), whose sum is σ = 970975712712. Its totient is φ = 485487856352.

The previous prime is 728231784529. The next prime is 728231784541. The reversal of 728231784531 is 135487132827.

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 728231784531 - 2¹ = 728231784529 is a prime.

It is a super-2 number, since 2×728231784531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728231784541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121371964086 + ... + 121371964091.

It is an arithmetic number, because the mean of its divisors is an integer number (242743928178).

Almost surely, 2^728231784531 is an apocalyptic number.

728231784531 is a deficient number, since it is larger than the sum of its proper divisors (242743928181).

728231784531 is a wasteful number, since it uses less digits than its factorization.

728231784531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242743928180.

The product of its digits is 2257920, while the sum is 51.

The spelling of 728231784531 in words is "seven hundred twenty-eight billion, two hundred thirty-one million, seven hundred eighty-four thousand, five hundred thirty-one".