33128081 has 4 divisors (see below), whose sum is σ = 37860672. Its totient is φ = 28395492.

The previous prime is 33128059. The next prime is 33128089. The reversal of 33128081 is 18082133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33128081 is a prime.

It is a super-2 number, since 2×33128081² = 2194939501485122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33128081.

It is not an unprimeable number, because it can be changed into a prime (33128089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2366285 + ... + 2366298.

It is an arithmetic number, because the mean of its divisors is an integer number (9465168).

Almost surely, 2^33128081 is an apocalyptic number.

It is an amenable number.

33128081 is a deficient number, since it is larger than the sum of its proper divisors (4732591).

33128081 is an equidigital number, since it uses as much as digits as its factorization.

33128081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732590.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 33128081 is about 5755.6998705631. The cubic root of 33128081 is about 321.1678712267.

The spelling of 33128081 in words is "thirty-three million, one hundred twenty-eight thousand, eighty-one".