33968721 has 8 divisors (see below), whose sum is σ = 45758944. Its totient is φ = 22412160.

The previous prime is 33968699. The next prime is 33968729. The reversal of 33968721 is 12786933.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 33968721 - 2⁵ = 33968689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33968721.

It is not an unprimeable number, because it can be changed into a prime (33968729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58075 + ... + 58656.

It is an arithmetic number, because the mean of its divisors is an integer number (5719868).

Almost surely, 2^33968721 is an apocalyptic number.

It is an amenable number.

33968721 is a deficient number, since it is larger than the sum of its proper divisors (11790223).

33968721 is a wasteful number, since it uses less digits than its factorization.

33968721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116831.

The product of its digits is 54432, while the sum is 39.

The square root of 33968721 is about 5828.2691255638. The cubic root of 33968721 is about 323.8618047282.

The spelling of 33968721 in words is "thirty-three million, nine hundred sixty-eight thousand, seven hundred twenty-one".