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30128 = 247269
BaseRepresentation
bin111010110110000
31112022212
413112300
51431003
6351252
7153560
oct72660
945285
1030128
11206aa
1215528
1310937
14ada0
158dd8
hex75b0

30128 has 20 divisors (see below), whose sum is σ = 66960. Its totient is φ = 12864.

The previous prime is 30119. The next prime is 30133. The reversal of 30128 is 82103.

30128 is nontrivially palindromic in base 15.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

30128 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23 + ... + 246.

It is an arithmetic number, because the mean of its divisors is an integer number (3348).

230128 is an apocalyptic number.

It is an amenable number.

30128 is an abundant number, since it is smaller than the sum of its proper divisors (36832).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33480).

30128 is a wasteful number, since it uses less digits than its factorization.

30128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 30128 is about 173.5741916300. The cubic root of 30128 is about 31.1164541088.

The spelling of 30128 in words is "thirty thousand, one hundred twenty-eight".