30728833 has 8 divisors (see below), whose sum is σ = 33221120. Its totient is φ = 28324080.

The previous prime is 30728827. The next prime is 30728837. The reversal of 30728833 is 33882703.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30728833 is a prime.

It is a super-2 number, since 2×30728833² = 1888522355083778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30728837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21153 + ... + 22558.

It is an arithmetic number, because the mean of its divisors is an integer number (4152640).

Almost surely, 2^30728833 is an apocalyptic number.

It is an amenable number.

30728833 is a deficient number, since it is larger than the sum of its proper divisors (2492287).

30728833 is a wasteful number, since it uses less digits than its factorization.

30728833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43767.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 30728833 is about 5543.3593605322. The cubic root of 30728833 is about 313.2194258005.

The spelling of 30728833 in words is "thirty million, seven hundred twenty-eight thousand, eight hundred thirty-three".