33728225 has 6 divisors (see below), whose sum is σ = 41823030. Its totient is φ = 26982560.

The previous prime is 33728213. The next prime is 33728231. The reversal of 33728225 is 52282733.

It can be written as a sum of positive squares in 3 ways, for example, as 3268864 + 30459361 = 1808^2 + 5519^2 .

It is not a de Polignac number, because 33728225 - 2⁴ = 33728209 is a prime.

It is a super-2 number, since 2×33728225² = 2275186323301250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33728191 and 33728200.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 674540 + ... + 674589.

It is an arithmetic number, because the mean of its divisors is an integer number (6970505).

Almost surely, 2^33728225 is an apocalyptic number.

It is an amenable number.

33728225 is a deficient number, since it is larger than the sum of its proper divisors (8094805).

33728225 is a wasteful number, since it uses less digits than its factorization.

33728225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349139 (or 1349134 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 33728225 is about 5807.6006233211. The cubic root of 33728225 is about 323.0956880853.

The spelling of 33728225 in words is "thirty-three million, seven hundred twenty-eight thousand, two hundred twenty-five".