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80728 = 2310091
BaseRepresentation
bin10011101101011000
311002201221
4103231120
510040403
61421424
7454234
oct235530
9132657
1080728
115571a
123a874
132a98b
14215c4
1518dbd
hex13b58

80728 has 8 divisors (see below), whose sum is σ = 151380. Its totient is φ = 40360.

The previous prime is 80713. The next prime is 80737. The reversal of 80728 is 82708.

It can be divided in two parts, 80 and 728, that added together give a palindrome (808).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

80728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5038 + ... + 5053.

280728 is an apocalyptic number.

It is an amenable number.

80728 is a deficient number, since it is larger than the sum of its proper divisors (70652).

80728 is a wasteful number, since it uses less digits than its factorization.

80728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10097 (or 10093 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 80728 is about 284.1267322868. The cubic root of 80728 is about 43.2190017002.

The spelling of 80728 in words is "eighty thousand, seven hundred twenty-eight".

Divisors: 1 2 4 8 10091 20182 40364 80728