33305989 has 4 divisors (see below), whose sum is σ = 33451660. Its totient is φ = 33160320.

The previous prime is 33305971. The next prime is 33305999. The reversal of 33305989 is 98950333.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13432225 + 19873764 = 3665^2 + 4458^2 .

It is a cyclic number.

It is not a de Polignac number, because 33305989 - 2¹⁷ = 33174917 is a prime.

It is a super-2 number, since 2×33305989² = 2218577806536242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33305969) 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, 72492 + ... + 72949.

It is an arithmetic number, because the mean of its divisors is an integer number (8362915).

Almost surely, 2^33305989 is an apocalyptic number.

It is an amenable number.

33305989 is a deficient number, since it is larger than the sum of its proper divisors (145671).

33305989 is a wasteful number, since it uses less digits than its factorization.

33305989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145670.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 33305989 is about 5771.1341173118. The cubic root of 33305989 is about 321.7417685821.

The spelling of 33305989 in words is "thirty-three million, three hundred five thousand, nine hundred eighty-nine".