728636847 has 8 divisors (see below), whose sum is σ = 1028663856. Its totient is φ = 457183872.

The previous prime is 728636837. The next prime is 728636851. The reversal of 728636847 is 748636827.

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

It is not a de Polignac number, because 728636847 - 2¹¹ = 728634799 is a prime.

It is a super-2 number, since 2×728636847² = 1061823309612202818, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 14286997 = 728636847 / (7 + 2 + 8 + 6 + 3 + 6 + 8 + 4 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 728636847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728636827) 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, 7143448 + ... + 7143549.

It is an arithmetic number, because the mean of its divisors is an integer number (128582982).

Almost surely, 2^728636847 is an apocalyptic number.

728636847 is a deficient number, since it is larger than the sum of its proper divisors (300027009).

728636847 is a wasteful number, since it uses less digits than its factorization.

728636847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14287017.

The product of its digits is 2709504, while the sum is 51.

The square root of 728636847 is about 26993.2741067104. The cubic root of 728636847 is about 899.8505294985.

The spelling of 728636847 in words is "seven hundred twenty-eight million, six hundred thirty-six thousand, eight hundred forty-seven".