728145 has 24 divisors (see below), whose sum is σ = 1377792. Its totient is φ = 352800.

The previous prime is 728131. The next prime is 728173. The reversal of 728145 is 541827.

It is not a de Polignac number, because 728145 - 2⁴ = 728129 is a prime.

It is an Ulam number.

728145 is a lucky number.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241 + ... + 1230.

It is an arithmetic number, because the mean of its divisors is an integer number (57408).

2⁷²⁸¹⁴⁵ is an apocalyptic number.

It is an amenable number.

728145 is a deficient number, since it is larger than the sum of its proper divisors (649647).

728145 is a wasteful number, since it uses less digits than its factorization.

728145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1490 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 728145 is about 853.3141273880. The cubic root of 728145 is about 89.9648010503.

It can be divided in two parts, 7281 and 45, that multiplied together give a triangular number (327645 = T₈₀₉).

The spelling of 728145 in words is "seven hundred twenty-eight thousand, one hundred forty-five".