30728106 has 32 divisors (see below), whose sum is σ = 69955200. Its totient is φ = 9992160.

The previous prime is 30728057. The next prime is 30728107. The reversal of 30728106 is 60182703.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 30728106.

It is not an unprimeable number, because it can be changed into a prime (30728107) 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, 4726 + ... + 9153.

It is an arithmetic number, because the mean of its divisors is an integer number (2186100).

Almost surely, 2^30728106 is an apocalyptic number.

30728106 is an abundant number, since it is smaller than the sum of its proper divisors (39227094).

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

30728106 is a wasteful number, since it uses less digits than its factorization.

30728106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13931 (or 13925 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 30728106 is about 5543.2937861889. The cubic root of 30728106 is about 313.2169556740.

The spelling of 30728106 in words is "thirty million, seven hundred twenty-eight thousand, one hundred six".