233428 has 18 divisors (see below), whose sum is σ = 446586. Its totient is φ = 106128.

The previous prime is 233423. The next prime is 233437. The reversal of 233428 is 824332.

It can be written as a sum of positive squares in only one way, i.e., 161604 + 71824 = 402^2 + 268^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 233399 and 233408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3451 + ... + 3517.

2²³³⁴²⁸ is an apocalyptic number.

It is an amenable number.

233428 is a deficient number, since it is larger than the sum of its proper divisors (213158).

233428 is a wasteful number, since it uses less digits than its factorization.

233428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 82 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 233428 is about 483.1438709122. The cubic root of 233428 is about 61.5721496637.

The spelling of 233428 in words is "two hundred thirty-three thousand, four hundred twenty-eight".