33679813 has 4 divisors (see below), whose sum is σ = 33874668. Its totient is φ = 33484960.

The previous prime is 33679757. The next prime is 33679829. The reversal of 33679813 is 31897633.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31897633 = 163 ⋅195691.

It can be written as a sum of positive squares in 2 ways, for example, as 15000129 + 18679684 = 3873^2 + 4322^2 .

It is a cyclic number.

It is not a de Polignac number, because 33679813 - 2⁹ = 33679301 is a prime.

It is a super-2 number, since 2×33679813² = 2268659607429938, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33679853) 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 3 ways as a sum of consecutive naturals, for example, 97168 + ... + 97513.

It is an arithmetic number, because the mean of its divisors is an integer number (8468667).

Almost surely, 2^33679813 is an apocalyptic number.

It is an amenable number.

33679813 is a deficient number, since it is larger than the sum of its proper divisors (194855).

33679813 is a wasteful number, since it uses less digits than its factorization.

33679813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194854.

The product of its digits is 81648, while the sum is 40.

The square root of 33679813 is about 5803.4311402824. The cubic root of 33679813 is about 322.9410283186.

The spelling of 33679813 in words is "thirty-three million, six hundred seventy-nine thousand, eight hundred thirteen".