206428 has 6 divisors (see below), whose sum is σ = 361256. Its totient is φ = 103212.

The previous prime is 206419. The next prime is 206447. The reversal of 206428 is 824602.

206428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×206428² = 85225038368, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 206399 and 206408.

It is a congruent number.

It is an unprimeable number.

206428 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, 25800 + ... + 25807.

2²⁰⁶⁴²⁸ is an apocalyptic number.

It is an amenable number.

206428 is a deficient number, since it is larger than the sum of its proper divisors (154828).

206428 is a wasteful number, since it uses less digits than its factorization.

206428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51611 (or 51609 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 206428 is about 454.3434824007. The cubic root of 206428 is about 59.1002795253.

The spelling of 206428 in words is "two hundred six thousand, four hundred twenty-eight".