33445728 has 36 divisors (see below), whose sum is σ = 95112108. Its totient is φ = 11148480.

The previous prime is 33445721. The next prime is 33445733. The reversal of 33445728 is 82754433.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×33445728² = 2237233442899968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 33445692 and 33445701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33445721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57778 + ... + 58353.

It is an arithmetic number, because the mean of its divisors is an integer number (2642003).

Almost surely, 2^33445728 is an apocalyptic number.

It is an amenable number.

33445728 is an abundant number, since it is smaller than the sum of its proper divisors (61666380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33445728 is a wasteful number, since it uses less digits than its factorization.

33445728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116147 (or 116136 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 33445728 is about 5783.2281642695. The cubic root of 33445728 is about 322.1911086001.

The spelling of 33445728 in words is "thirty-three million, four hundred forty-five thousand, seven hundred twenty-eight".