212728 has 8 divisors (see below), whose sum is σ = 398880. Its totient is φ = 106360.

The previous prime is 212701. The next prime is 212777. The reversal of 212728 is 827212.

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

It is a junction number, because it is equal to n+sod(n) for n = 212699 and 212708.

It is a congruent number.

It is an unprimeable number.

212728 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, 13288 + ... + 13303.

It is an arithmetic number, because the mean of its divisors is an integer number (49860).

2²¹²⁷²⁸ is an apocalyptic number.

It is an amenable number.

212728 is a deficient number, since it is larger than the sum of its proper divisors (186152).

212728 is a wasteful number, since it uses less digits than its factorization.

212728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26597 (or 26593 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 212728 is about 461.2244572873. The cubic root of 212728 is about 59.6954942556.

The spelling of 212728 in words is "two hundred twelve thousand, seven hundred twenty-eight".