33133340 has 96 divisors (see below), whose sum is σ = 81285120. Its totient is φ = 11252736.

The previous prime is 33133339. The next prime is 33133361. The reversal of 33133340 is 4333133.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148469 + ... + 148691.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^33133340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33133340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40642560).

33133340 is an abundant number, since it is smaller than the sum of its proper divisors (48151780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33133340 is a wasteful number, since it uses less digits than its factorization.

33133340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 20.

The square root of 33133340 is about 5756.1567039128. The cubic root of 33133340 is about 321.1848651929.

Adding to 33133340 its reverse (4333133), we get a palindrome (37466473).

The spelling of 33133340 in words is "thirty-three million, one hundred thirty-three thousand, three hundred forty".