33158428 has 6 divisors (see below), whose sum is σ = 58027256. Its totient is φ = 16579212.

The previous prime is 33158423. The next prime is 33158429. The reversal of 33158428 is 82485133.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 33158393 and 33158402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33158423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4144800 + ... + 4144807.

Almost surely, 2^33158428 is an apocalyptic number.

It is an amenable number.

33158428 is a deficient number, since it is larger than the sum of its proper divisors (24868828).

33158428 is a wasteful number, since it uses less digits than its factorization.

33158428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8289611 (or 8289609 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 33158428 is about 5758.3355233956. The cubic root of 33158428 is about 321.2659099753.

The spelling of 33158428 in words is "thirty-three million, one hundred fifty-eight thousand, four hundred twenty-eight".