33530240 has 32 divisors (see below), whose sum is σ = 80159760. Its totient is φ = 13411840.

The previous prime is 33530183. The next prime is 33530249. The reversal of 33530240 is 4203533.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×33530240² = 2248553988915200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33530249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 25556 + ... + 26835.

Almost surely, 2^33530240 is an apocalyptic number.

It is an amenable number.

33530240 is an abundant number, since it is smaller than the sum of its proper divisors (46629520).

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

33530240 is an equidigital number, since it uses as much as digits as its factorization.

33530240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52410 (or 52398 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 20.

The square root of 33530240 is about 5790.5302002494. The cubic root of 33530240 is about 322.4622554629.

Adding to 33530240 its reverse (4203533), we get a palindrome (37733773).

The spelling of 33530240 in words is "thirty-three million, five hundred thirty thousand, two hundred forty".