728131788209 has 16 divisors (see below), whose sum is σ = 842044686336. Its totient is φ = 616731570000.

The previous prime is 728131788199. The next prime is 728131788233. The reversal of 728131788209 is 902887131827.

It is not a de Polignac number, because 728131788209 - 2¹² = 728131784113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728131788239) 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 15 ways as a sum of consecutive naturals, for example, 1408427 + ... + 1854704.

It is an arithmetic number, because the mean of its divisors is an integer number (52627792896).

Almost surely, 2^728131788209 is an apocalyptic number.

It is an amenable number.

728131788209 is a deficient number, since it is larger than the sum of its proper divisors (113912898127).

728131788209 is a wasteful number, since it uses less digits than its factorization.

728131788209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263516.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 728131788209 in words is "seven hundred twenty-eight billion, one hundred thirty-one million, seven hundred eighty-eight thousand, two hundred nine".