33679981 has 8 divisors (see below), whose sum is σ = 36278784. Its totient is φ = 31175760.

The previous prime is 33679979. The next prime is 33679993. The reversal of 33679981 is 18997633.

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

It is a cyclic number.

It is not a de Polignac number, because 33679981 - 2¹ = 33679979 is a prime.

It is a super-2 number, since 2×33679981² = 2268682240320722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33679931) 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, 22906 + ... + 24331.

It is an arithmetic number, because the mean of its divisors is an integer number (4534848).

Almost surely, 2^33679981 is an apocalyptic number.

33679981 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

33679981 is a deficient number, since it is larger than the sum of its proper divisors (2598803).

33679981 is a wasteful number, since it uses less digits than its factorization.

33679981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47291.

The product of its digits is 244944, while the sum is 46.

The square root of 33679981 is about 5803.4456144604. The cubic root of 33679981 is about 322.9415652773.

The spelling of 33679981 in words is "thirty-three million, six hundred seventy-nine thousand, nine hundred eighty-one".