33168728 has 16 divisors (see below), whose sum is σ = 62370000. Its totient is φ = 16536736.

The previous prime is 33168727. The next prime is 33168731. The reversal of 33168728 is 82786133.

It is a happy number.

It is a super-2 number, since 2×33168728² = 2200329034275968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33168691 and 33168700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33168727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2903 + ... + 8646.

It is an arithmetic number, because the mean of its divisors is an integer number (3898125).

Almost surely, 2^33168728 is an apocalyptic number.

It is an amenable number.

33168728 is a deficient number, since it is larger than the sum of its proper divisors (29201272).

33168728 is a wasteful number, since it uses less digits than its factorization.

33168728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11914 (or 11910 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 33168728 is about 5759.2298096186. The cubic root of 33168728 is about 321.2991714667.

The spelling of 33168728 in words is "thirty-three million, one hundred sixty-eight thousand, seven hundred twenty-eight".