33071728 has 20 divisors (see below), whose sum is σ = 64186120. Its totient is φ = 16507584.

The previous prime is 33071693. The next prime is 33071737. The reversal of 33071728 is 82717033.

It is a self number, because there is not a number n which added to its sum of digits gives 33071728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10426 + ... + 13222.

It is an arithmetic number, because the mean of its divisors is an integer number (3209306).

Almost surely, 2^33071728 is an apocalyptic number.

It is an amenable number.

33071728 is a deficient number, since it is larger than the sum of its proper divisors (31114392).

33071728 is a wasteful number, since it uses less digits than its factorization.

33071728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544 (or 3538 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 33071728 is about 5750.8023787990. The cubic root of 33071728 is about 320.9856587894.

The spelling of 33071728 in words is "thirty-three million, seventy-one thousand, seven hundred twenty-eight".