155728 has 10 divisors (see below), whose sum is σ = 301754. Its totient is φ = 77856.

The previous prime is 155723. The next prime is 155731. The reversal of 155728 is 827551.

It can be written as a sum of positive squares in only one way, i.e., 150544 + 5184 = 388^2 + 72^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155696 and 155705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4851 + ... + 4882.

2¹⁵⁵⁷²⁸ is an apocalyptic number.

It is an amenable number.

155728 is a deficient number, since it is larger than the sum of its proper divisors (146026).

155728 is an equidigital number, since it uses as much as digits as its factorization.

155728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9741 (or 9735 counting only the distinct ones).

The product of its digits is 2800, while the sum is 28.

The square root of 155728 is about 394.6238715537. The cubic root of 155728 is about 53.8008208717.

The spelling of 155728 in words is "one hundred fifty-five thousand, seven hundred twenty-eight".