728644443 has 4 divisors (see below), whose sum is σ = 971525928. Its totient is φ = 485762960.

The previous prime is 728644403. The next prime is 728644481. The reversal of 728644443 is 344446827.

It is a happy number.

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 728644443 - 2⁸ = 728644187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 728644395 and 728644404.

It is not an unprimeable number, because it can be changed into a prime (728644403) 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 3 ways as a sum of consecutive naturals, for example, 121440738 + ... + 121440743.

It is an arithmetic number, because the mean of its divisors is an integer number (242881482).

Almost surely, 2^728644443 is an apocalyptic number.

728644443 is a deficient number, since it is larger than the sum of its proper divisors (242881485).

728644443 is a wasteful number, since it uses less digits than its factorization.

728644443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242881484.

The product of its digits is 516096, while the sum is 42.

The square root of 728644443 is about 26993.4148080601. The cubic root of 728644443 is about 899.8536564522.

The spelling of 728644443 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, four hundred forty-three".