33136640 has 56 divisors (see below), whose sum is σ = 79621380. Its totient is φ = 13238272.

The previous prime is 33136639. The next prime is 33136643. The reversal of 33136640 is 4663133.

It can be written as a sum of positive squares in 2 ways, for example, as 32444416 + 692224 = 5696^2 + 832^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33136643) 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, 40556 + ... + 41364.

Almost surely, 2^33136640 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 33136640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39810690).

33136640 is an abundant number, since it is smaller than the sum of its proper divisors (46484740).

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

33136640 is an frugal number, since it uses more digits than its factorization.

33136640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 33136640 is about 5756.4433463728. The cubic root of 33136640 is about 321.1955279158.

Adding to 33136640 its reverse (4663133), we get a palindrome (37799773).

The spelling of 33136640 in words is "thirty-three million, one hundred thirty-six thousand, six hundred forty".