728990 has 16 divisors (see below), whose sum is σ = 1321920. Its totient is φ = 289440.

The previous prime is 728971. The next prime is 728993. The reversal of 728990 is 99827.

It is a self number, because there is not a number n which added to its sum of digits gives 728990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728993) by changing a digit.

728990 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2555 + ... + 2825.

It is an arithmetic number, because the mean of its divisors is an integer number (82620).

2⁷²⁸⁹⁹⁰ is an apocalyptic number.

728990 is a deficient number, since it is larger than the sum of its proper divisors (592930).

728990 is a wasteful number, since it uses less digits than its factorization.

728990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 728990 is about 853.8091121556. The cubic root of 728990 is about 89.9995884755. Note that the first 3 decimals are identical.

The spelling of 728990 in words is "seven hundred twenty-eight thousand, nine hundred ninety".