Search a number
-
+
728945 = 5759353
BaseRepresentation
bin10110001111101110001
31101000220222
42301331301
5141311240
623342425
76124130
oct2617561
91330828
10728945
11458738
122b1a15
131c6a39
1414d917
15e5eb5
hexb1f71

728945 has 16 divisors (see below), whose sum is σ = 1019520. Its totient is φ = 489984.

The previous prime is 728941. The next prime is 728947. The reversal of 728945 is 549827.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 728945 - 22 = 728941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a d-powerful number, because it can be written as 75 + 218 + 95 + 82 + 44 + 58 .

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728945.

It is not an unprimeable number, because it can be changed into a prime (728941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1889 + ... + 2241.

It is an arithmetic number, because the mean of its divisors is an integer number (63720).

2728945 is an apocalyptic number.

It is an amenable number.

728945 is a deficient number, since it is larger than the sum of its proper divisors (290575).

728945 is a wasteful number, since it uses less digits than its factorization.

728945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424.

The product of its digits is 20160, while the sum is 35.

The square root of 728945 is about 853.7827592544. The cubic root of 728945 is about 89.9977365686.

The spelling of 728945 in words is "seven hundred twenty-eight thousand, nine hundred forty-five".

Divisors: 1 5 7 35 59 295 353 413 1765 2065 2471 12355 20827 104135 145789 728945