30113728 has 28 divisors (see below), whose sum is σ = 60487560. Its totient is φ = 14872832.

The previous prime is 30113723. The next prime is 30113737. The reversal of 30113728 is 82731103.

It is a super-2 number, since 2×30113728² = 1813673228115968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30113723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2478 + ... + 8146.

It is an arithmetic number, because the mean of its divisors is an integer number (2160270).

Almost surely, 2^30113728 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 30113728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30243780).

30113728 is an abundant number, since it is smaller than the sum of its proper divisors (30373832).

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

30113728 is an equidigital number, since it uses as much as digits as its factorization.

30113728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5764 (or 5754 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 30113728 is about 5487.5976528897. The cubic root of 30113728 is about 311.1153991850.

The spelling of 30113728 in words is "thirty million, one hundred thirteen thousand, seven hundred twenty-eight".