242728 has 8 divisors (see below), whose sum is σ = 455130. Its totient is φ = 121360.

The previous prime is 242713. The next prime is 242729. The reversal of 242728 is 827242.

It can be written as a sum of positive squares in only one way, i.e., 232324 + 10404 = 482^2 + 102^2 .

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

It is not an unprimeable number, because it can be changed into a prime (242729) by changing a digit.

242728 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, 15163 + ... + 15178.

2²⁴²⁷²⁸ is an apocalyptic number.

It is an amenable number.

242728 is a deficient number, since it is larger than the sum of its proper divisors (212402).

242728 is a wasteful number, since it uses less digits than its factorization.

242728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347 (or 30343 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 242728 is about 492.6743346268. The cubic root of 242728 is about 62.3792227561.

The spelling of 242728 in words is "two hundred forty-two thousand, seven hundred twenty-eight".