728658947 has 4 divisors (see below), whose sum is σ = 771521256. Its totient is φ = 685796640.

The previous prime is 728658943. The next prime is 728658971. The reversal of 728658947 is 749856827.

728658947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 728658947 - 2² = 728658943 is a prime.

It is a super-2 number, since 2×728658947² = 1061887722086297618, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728658892 and 728658901.

It is not an unprimeable number, because it can be changed into a prime (728658943) 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, 21431129 + ... + 21431162.

It is an arithmetic number, because the mean of its divisors is an integer number (192880314).

Almost surely, 2^728658947 is an apocalyptic number.

728658947 is a deficient number, since it is larger than the sum of its proper divisors (42862309).

728658947 is a wasteful number, since it uses less digits than its factorization.

728658947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42862308.

The product of its digits is 6773760, while the sum is 56.

The square root of 728658947 is about 26993.6834648404. The cubic root of 728658947 is about 899.8596270784.

The spelling of 728658947 in words is "seven hundred twenty-eight million, six hundred fifty-eight thousand, nine hundred forty-seven".