728611286591 has 4 divisors (see below), whose sum is σ = 729687522552. Its totient is φ = 727535050632.

The previous prime is 728611286479. The next prime is 728611286629. The reversal of 728611286591 is 195682116827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728611286591 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 (728611288591) 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, 538116965 + ... + 538118318.

It is an arithmetic number, because the mean of its divisors is an integer number (182421880638).

Almost surely, 2^728611286591 is an apocalyptic number.

728611286591 is a deficient number, since it is larger than the sum of its proper divisors (1076235961).

728611286591 is a wasteful number, since it uses less digits than its factorization.

728611286591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076235960.

The product of its digits is 2903040, while the sum is 56.

The spelling of 728611286591 in words is "seven hundred twenty-eight billion, six hundred eleven million, two hundred eighty-six thousand, five hundred ninety-one".