728634 has 8 divisors (see below), whose sum is σ = 1457280. Its totient is φ = 242876.

The previous prime is 728627. The next prime is 728639. The reversal of 728634 is 436827.

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

728634 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (728639) by changing a digit.

728634 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 in 3 ways as a sum of consecutive naturals, for example, 60714 + ... + 60725.

It is an arithmetic number, because the mean of its divisors is an integer number (182160).

2⁷²⁸⁶³⁴ is an apocalyptic number.

728634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728634 is a wasteful number, since it uses less digits than its factorization.

728634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121444.

The product of its digits is 8064, while the sum is 30.

The square root of 728634 is about 853.6006091844. The cubic root of 728634 is about 89.9849357503.

The spelling of 728634 in words is "seven hundred twenty-eight thousand, six hundred thirty-four".