728188 has 6 divisors (see below), whose sum is σ = 1274336. Its totient is φ = 364092.

The previous prime is 728173. The next prime is 728191. The reversal of 728188 is 881827.

It is a congruent number.

It is an unprimeable number.

728188 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 91020 + ... + 91027.

2⁷²⁸¹⁸⁸ is an apocalyptic number.

It is an amenable number.

728188 is a deficient number, since it is larger than the sum of its proper divisors (546148).

728188 is a wasteful number, since it uses less digits than its factorization.

728188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182051 (or 182049 counting only the distinct ones).

The product of its digits is 7168, while the sum is 34.

The square root of 728188 is about 853.3393228956. The cubic root of 728188 is about 89.9665719477.

The spelling of 728188 in words is "seven hundred twenty-eight thousand, one hundred eighty-eight".