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120728 = 2315091
BaseRepresentation
bin11101011110011000
320010121102
4131132120
512330403
62330532
71011656
oct353630
9203542
10120728
1182783
1259a48
1342c4a
1431dd6
1525b88
hex1d798

120728 has 8 divisors (see below), whose sum is σ = 226380. Its totient is φ = 60360.

The previous prime is 120721. The next prime is 120737. The reversal of 120728 is 827021.

Adding to 120728 its reverse (827021), we get a palindrome (947749).

It can be divided in two parts, 120 and 728, that added together give a palindrome (848).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120721) by changing a digit.

120728 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, 7538 + ... + 7553.

2120728 is an apocalyptic number.

It is an amenable number.

120728 is a deficient number, since it is larger than the sum of its proper divisors (105652).

120728 is a wasteful number, since it uses less digits than its factorization.

120728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15097 (or 15093 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 120728 is about 347.4593501404. The cubic root of 120728 is about 49.4237850352.

The spelling of 120728 in words is "one hundred twenty thousand, seven hundred twenty-eight".

Divisors: 1 2 4 8 15091 30182 60364 120728