30865128 has 64 divisors (see below), whose sum is σ = 90357120. Its totient is φ = 8601600.

The previous prime is 30865123. The next prime is 30865147. The reversal of 30865128 is 82156803.

It is a happy number.

It is a super-2 number, since 2×30865128² = 1905312252912768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30865123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4648 + ... + 9128.

It is an arithmetic number, because the mean of its divisors is an integer number (1411830).

Almost surely, 2^30865128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30865128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45178560).

30865128 is an abundant number, since it is smaller than the sum of its proper divisors (59491992).

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

30865128 is a wasteful number, since it uses less digits than its factorization.

30865128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4538 (or 4534 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 30865128 is about 5555.6392971466. The cubic root of 30865128 is about 313.6818284399.

The spelling of 30865128 in words is "thirty million, eight hundred sixty-five thousand, one hundred twenty-eight".