30398720 has 144 divisors (see below), whose sum is σ = 84768768. Its totient is φ = 10321920.

The previous prime is 30398717. The next prime is 30398723. The reversal of 30398720 is 2789303.

It is an interprime number because it is at equal distance from previous prime (30398717) and next prime (30398723).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (30398723) 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, 239297 + ... + 239423.

It is an arithmetic number, because the mean of its divisors is an integer number (588672).

Almost surely, 2^30398720 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 30398720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42384384).

30398720 is an abundant number, since it is smaller than the sum of its proper divisors (54370048).

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

30398720 is a wasteful number, since it uses less digits than its factorization.

30398720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 30398720 is about 5513.5034234142. The cubic root of 30398720 is about 312.0937697552.

The spelling of 30398720 in words is "thirty million, three hundred ninety-eight thousand, seven hundred twenty".