728947049 has 4 divisors (see below), whose sum is σ = 729270864. Its totient is φ = 728623236.

The previous prime is 728947007. The next prime is 728947057. The reversal of 728947049 is 940749827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 940749827 = 37 ⋅25425671.

It is a cyclic number.

It is not a de Polignac number, because 728947049 - 2¹⁶ = 728881513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728946988 and 728947006.

It is not an unprimeable number, because it can be changed into a prime (728947949) 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 3 ways as a sum of consecutive naturals, for example, 158507 + ... + 163040.

It is an arithmetic number, because the mean of its divisors is an integer number (182317716).

Almost surely, 2^728947049 is an apocalyptic number.

It is an amenable number.

728947049 is a deficient number, since it is larger than the sum of its proper divisors (323815).

728947049 is a wasteful number, since it uses less digits than its factorization.

728947049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323814.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 728947049 is about 26999.0194081193. The cubic root of 728947049 is about 899.9782089374.

The spelling of 728947049 in words is "seven hundred twenty-eight million, nine hundred forty-seven thousand, forty-nine".