30303720 has 160 divisors (see below), whose sum is σ = 104544000. Its totient is φ = 7869312.

The previous prime is 30303701. The next prime is 30303743. The reversal of 30303720 is 2730303.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 30303693 and 30303702.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 152181 + ... + 152379.

It is an arithmetic number, because the mean of its divisors is an integer number (653400).

Almost surely, 2^30303720 is an apocalyptic number.

30303720 is a gapful number since it is divisible by the number (30) 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 30303720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52272000).

30303720 is an abundant number, since it is smaller than the sum of its proper divisors (74240280).

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

30303720 is a wasteful number, since it uses less digits than its factorization.

30303720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 18.

The square root of 30303720 is about 5504.8814701136. The cubic root of 30303720 is about 311.7683191283.

The spelling of 30303720 in words is "thirty million, three hundred three thousand, seven hundred twenty".