33290728 has 8 divisors (see below), whose sum is σ = 62420130. Its totient is φ = 16645360.

The previous prime is 33290723. The next prime is 33290737. The reversal of 33290728 is 82709233.

It can be written as a sum of positive squares in only one way, i.e., 32512804 + 777924 = 5702^2 + 882^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×33290728² = 2216545141539968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33290693 and 33290702.

It is not an unprimeable number, because it can be changed into a prime (33290723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2080663 + ... + 2080678.

Almost surely, 2^33290728 is an apocalyptic number.

It is an amenable number.

33290728 is a deficient number, since it is larger than the sum of its proper divisors (29129402).

33290728 is a wasteful number, since it uses less digits than its factorization.

33290728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161347 (or 4161343 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 33290728 is about 5769.8117820255. The cubic root of 33290728 is about 321.6926197511.

The spelling of 33290728 in words is "thirty-three million, two hundred ninety thousand, seven hundred twenty-eight".