728128235 has 8 divisors (see below), whose sum is σ = 874341216. Its totient is φ = 582111040.

The previous prime is 728128189. The next prime is 728128237. The reversal of 728128235 is 532821827.

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

It is not a de Polignac number, because 728128235 - 2²⁶ = 661019371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728128237) 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, 40634 + ... + 55743.

It is an arithmetic number, because the mean of its divisors is an integer number (109292652).

Almost surely, 2^728128235 is an apocalyptic number.

728128235 is a deficient number, since it is larger than the sum of its proper divisors (146212981).

728128235 is a wasteful number, since it uses less digits than its factorization.

728128235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97893.

The product of its digits is 53760, while the sum is 38.

The square root of 728128235 is about 26983.8513744795. The cubic root of 728128235 is about 899.6411058736.

The spelling of 728128235 in words is "seven hundred twenty-eight million, one hundred twenty-eight thousand, two hundred thirty-five".