33144640 has 28 divisors (see below), whose sum is σ = 78926436. Its totient is φ = 13257728.

The previous prime is 33144613. The next prime is 33144649. The reversal of 33144640 is 4644133.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20866624 + 12278016 = 4568^2 + 3504^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33144649) 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, 51469 + ... + 52108.

Almost surely, 2^33144640 is an apocalyptic number.

It is an amenable number.

33144640 is an abundant number, since it is smaller than the sum of its proper divisors (45781796).

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

33144640 is a wasteful number, since it uses less digits than its factorization.

33144640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103594 (or 103584 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 33144640 is about 5757.1381779492. The cubic root of 33144640 is about 321.2213740030.

Adding to 33144640 its reverse (4644133), we get a palindrome (37788773).

The spelling of 33144640 in words is "thirty-three million, one hundred forty-four thousand, six hundred forty".