33305040 has 160 divisors (see below), whose sum is σ = 121599360. Its totient is φ = 8349696.

The previous prime is 33305011. The next prime is 33305071. The reversal of 33305040 is 4050333.

It is a happy number.

It is a super-2 number, since 2×33305040² = 2218451378803200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36267 + ... + 37173.

It is an arithmetic number, because the mean of its divisors is an integer number (759996).

Almost surely, 2^33305040 is an apocalyptic number.

33305040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33305040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60799680).

33305040 is an abundant number, since it is smaller than the sum of its proper divisors (88294320).

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

33305040 is a wasteful number, since it uses less digits than its factorization.

33305040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 18.

The square root of 33305040 is about 5771.0518971848. The cubic root of 33305040 is about 321.7387127169.

Adding to 33305040 its reverse (4050333), we get a palindrome (37355373).

The spelling of 33305040 in words is "thirty-three million, three hundred five thousand, forty".