728056643 has 8 divisors (see below), whose sum is σ = 733471200. Its totient is φ = 722659840.

The previous prime is 728056619. The next prime is 728056657. The reversal of 728056643 is 346650827.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 728056643 - 2¹⁴ = 728040259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728056643.

It is not an unprimeable number, because it can be changed into a prime (728056663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84338 + ... + 92568.

It is an arithmetic number, because the mean of its divisors is an integer number (91683900).

Almost surely, 2^728056643 is an apocalyptic number.

728056643 is a deficient number, since it is larger than the sum of its proper divisors (5414557).

728056643 is a wasteful number, since it uses less digits than its factorization.

728056643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8877.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 728056643 is about 26982.5247706733. The cubic root of 728056643 is about 899.6116196677.

The spelling of 728056643 in words is "seven hundred twenty-eight million, fifty-six thousand, six hundred forty-three".