33406681 has 12 divisors (see below), whose sum is σ = 42394320. Its totient is φ = 26030760.

The previous prime is 33406679. The next prime is 33406691. The reversal of 33406681 is 18660433.

It is not a de Polignac number, because 33406681 - 2¹ = 33406679 is a prime.

It is a super-2 number, since 2×33406681² = 2232012670871522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33406601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30451 + ... + 31528.

It is an arithmetic number, because the mean of its divisors is an integer number (3532860).

Almost surely, 2^33406681 is an apocalyptic number.

It is an amenable number.

33406681 is a deficient number, since it is larger than the sum of its proper divisors (8987639).

33406681 is a wasteful number, since it uses less digits than its factorization.

33406681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62004 (or 61997 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 33406681 is about 5779.8512956650. The cubic root of 33406681 is about 322.0656765845.

It can be divided in two parts, 3340 and 6681, that multiplied together give a triangular number (22314540 = T₆₆₈₀).

The spelling of 33406681 in words is "thirty-three million, four hundred six thousand, six hundred eighty-one".