30871128 has 32 divisors (see below), whose sum is σ = 77414400. Its totient is φ = 10258848.

The previous prime is 30871111. The next prime is 30871147. The reversal of 30871128 is 82117803.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 30871095 and 30871104.

It is a congruent number.

It is an unprimeable number.

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, 6825 + ... + 10407.

It is an arithmetic number, because the mean of its divisors is an integer number (2419200).

Almost surely, 2^30871128 is an apocalyptic number.

It is an amenable number.

30871128 is an abundant number, since it is smaller than the sum of its proper divisors (46543272).

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

30871128 is a wasteful number, since it uses less digits than its factorization.

30871128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951 (or 3947 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 30871128 is about 5556.1792627668. The cubic root of 30871128 is about 313.7021530927.

The spelling of 30871128 in words is "thirty million, eight hundred seventy-one thousand, one hundred twenty-eight".