728891441 has 4 divisors (see below), whose sum is σ = 729157632. Its totient is φ = 728625252.

The previous prime is 728891431. The next prime is 728891477. The reversal of 728891441 is 144198827.

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.

It is a cyclic number.

It is not a de Polignac number, because 728891441 - 2⁶ = 728891377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 728891392 and 728891401.

It is not an unprimeable number, because it can be changed into a prime (728891431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128945 + ... + 134478.

It is an arithmetic number, because the mean of its divisors is an integer number (182289408).

Almost surely, 2^728891441 is an apocalyptic number.

It is an amenable number.

728891441 is a deficient number, since it is larger than the sum of its proper divisors (266191).

728891441 is a wasteful number, since it uses less digits than its factorization.

728891441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266190.

The product of its digits is 129024, while the sum is 44.

The square root of 728891441 is about 26997.9895732997. The cubic root of 728891441 is about 899.9553232967.

The spelling of 728891441 in words is "seven hundred twenty-eight million, eight hundred ninety-one thousand, four hundred forty-one".