728725 has 12 divisors (see below), whose sum is σ = 915616. Its totient is φ = 575280.

The previous prime is 728723. The next prime is 728729. The reversal of 728725 is 527827.

It is not a de Polignac number, because 728725 - 2¹ = 728723 is a prime.

It is a Duffinian number.

728725 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728723) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2434 + ... + 2716.

2⁷²⁸⁷²⁵ is an apocalyptic number.

It is an amenable number.

728725 is a deficient number, since it is larger than the sum of its proper divisors (186891).

728725 is a wasteful number, since it uses less digits than its factorization.

728725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 391 counting only the distinct ones).

The product of its digits is 7840, while the sum is 31.

The square root of 728725 is about 853.6539111373. The cubic root of 728725 is about 89.9886817043.

The spelling of 728725 in words is "seven hundred twenty-eight thousand, seven hundred twenty-five".