30639228 has 24 divisors (see below), whose sum is σ = 72017232. Its totient is φ = 10137984.

The previous prime is 30639227. The next prime is 30639233. The reversal of 30639228 is 82293603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30639221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7675 + ... + 10962.

It is an arithmetic number, because the mean of its divisors is an integer number (3000718).

Almost surely, 2^30639228 is an apocalyptic number.

It is an amenable number.

30639228 is an abundant number, since it is smaller than the sum of its proper divisors (41378004).

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

30639228 is a wasteful number, since it uses less digits than its factorization.

30639228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18781 (or 18779 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 30639228 is about 5535.2712670654. The cubic root of 30639228 is about 312.9146810567.

The spelling of 30639228 in words is "thirty million, six hundred thirty-nine thousand, two hundred twenty-eight".