33128413 has 8 divisors (see below), whose sum is σ = 33774080. Its totient is φ = 32488560.

The previous prime is 33128399. The next prime is 33128423. The reversal of 33128413 is 31482133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 33128413 - 2⁹ = 33127901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33128423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11068 + ... + 13738.

It is an arithmetic number, because the mean of its divisors is an integer number (4221760).

Almost surely, 2^33128413 is an apocalyptic number.

It is an amenable number.

33128413 is a deficient number, since it is larger than the sum of its proper divisors (645667).

33128413 is a wasteful number, since it uses less digits than its factorization.

33128413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907.

The product of its digits is 1728, while the sum is 25.

The square root of 33128413 is about 5755.7287114665. The cubic root of 33128413 is about 321.1689441068.

The spelling of 33128413 in words is "thirty-three million, one hundred twenty-eight thousand, four hundred thirteen".