30370728 has 32 divisors (see below), whose sum is σ = 77695200. Its totient is φ = 9887808.

The previous prime is 30370723. The next prime is 30370729. The reversal of 30370728 is 82707303.

It is a super-2 number, since 2×30370728² = 1844762238499968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30370695 and 30370704.

It is not an unprimeable number, because it can be changed into a prime (30370723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13683 + ... + 15746.

It is an arithmetic number, because the mean of its divisors is an integer number (2427975).

Almost surely, 2^30370728 is an apocalyptic number.

It is an amenable number.

30370728 is an abundant number, since it is smaller than the sum of its proper divisors (47324472).

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

30370728 is a wasteful number, since it uses less digits than its factorization.

30370728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29481 (or 29477 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 30370728 is about 5510.9643439238. The cubic root of 30370728 is about 311.9979454171.

The spelling of 30370728 in words is "thirty million, three hundred seventy thousand, seven hundred twenty-eight".