33681312 has 96 divisors (see below), whose sum is σ = 112291200. Its totient is φ = 9621504.

The previous prime is 33681311. The next prime is 33681331. The reversal of 33681312 is 21318633.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×33681312² = 2268861556082688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (33681311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3264 + ... + 8832.

It is an arithmetic number, because the mean of its divisors is an integer number (1169700).

Almost surely, 2^33681312 is an apocalyptic number.

33681312 is a gapful number since it is divisible by the number (32) 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 33681312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56145600).

33681312 is an abundant number, since it is smaller than the sum of its proper divisors (78609888).

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

33681312 is a wasteful number, since it uses less digits than its factorization.

33681312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5595 (or 5581 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 33681312 is about 5803.5602865827. The cubic root of 33681312 is about 322.9458193331.

Adding to 33681312 its reverse (21318633), we get a palindrome (54999945).

The spelling of 33681312 in words is "thirty-three million, six hundred eighty-one thousand, three hundred twelve".