33143428 has 6 divisors (see below), whose sum is σ = 58001006. Its totient is φ = 16571712.

The previous prime is 33143419. The next prime is 33143431. The reversal of 33143428 is 82434133.

It can be written as a sum of positive squares in only one way, i.e., 27373824 + 5769604 = 5232^2 + 2402^2 .

It is a junction number, because it is equal to n+sod(n) for n = 33143396 and 33143405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4142925 + ... + 4142932.

Almost surely, 2^33143428 is an apocalyptic number.

It is an amenable number.

33143428 is a deficient number, since it is larger than the sum of its proper divisors (24857578).

33143428 is a wasteful number, since it uses less digits than its factorization.

33143428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8285861 (or 8285859 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 33143428 is about 5757.0329163554. The cubic root of 33143428 is about 321.2174585881.

The spelling of 33143428 in words is "thirty-three million, one hundred forty-three thousand, four hundred twenty-eight".