30728226 has 16 divisors (see below), whose sum is σ = 63576000. Its totient is φ = 9889488.

The previous prime is 30728219. The next prime is 30728227. The reversal of 30728226 is 62282703.

It is a junction number, because it is equal to n+sod(n) for n = 30728193 and 30728202.

It is not an unprimeable number, because it can be changed into a prime (30728227) 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, 88126 + ... + 88473.

It is an arithmetic number, because the mean of its divisors is an integer number (3973500).

Almost surely, 2^30728226 is an apocalyptic number.

30728226 is an abundant number, since it is smaller than the sum of its proper divisors (32847774).

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

30728226 is a wasteful number, since it uses less digits than its factorization.

30728226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176633.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 30728226 is about 5543.3046100679. The cubic root of 30728226 is about 313.2173634005.

The spelling of 30728226 in words is "thirty million, seven hundred twenty-eight thousand, two hundred twenty-six".