728328605421 has 8 divisors (see below), whose sum is σ = 971111143584. Its totient is φ = 485549235440.

The previous prime is 728328605387. The next prime is 728328605449. The reversal of 728328605421 is 124506823827.

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 728328605421 - 2⁶ = 728328605357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728328605491) 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, 190335 + ... + 1221836.

It is an arithmetic number, because the mean of its divisors is an integer number (121388892948).

Almost surely, 2^728328605421 is an apocalyptic number.

It is an amenable number.

728328605421 is a deficient number, since it is larger than the sum of its proper divisors (242782538163).

728328605421 is a wasteful number, since it uses less digits than its factorization.

728328605421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584091.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 728328605421 in words is "seven hundred twenty-eight billion, three hundred twenty-eight million, six hundred five thousand, four hundred twenty-one".