30238728 has 64 divisors (see below), whose sum is σ = 85713600. Its totient is φ = 8812800.

The previous prime is 30238727. The next prime is 30238783. The reversal of 30238728 is 82783203.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (30238727) 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, 3378 + ... + 8478.

It is an arithmetic number, because the mean of its divisors is an integer number (1339275).

Almost surely, 2^30238728 is an apocalyptic number.

30238728 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30238728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42856800).

30238728 is an abundant number, since it is smaller than the sum of its proper divisors (55474872).

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

30238728 is a wasteful number, since it uses less digits than its factorization.

30238728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142 (or 5138 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 30238728 is about 5498.9751772489. The cubic root of 30238728 is about 311.5452777611.

The spelling of 30238728 in words is "thirty million, two hundred thirty-eight thousand, seven hundred twenty-eight".