30212728 has 64 divisors (see below), whose sum is σ = 71285760. Its totient is φ = 11684736.

The previous prime is 30212719. The next prime is 30212737. The reversal of 30212728 is 82721203.

It is an interprime number because it is at equal distance from previous prime (30212719) and next prime (30212737).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33775 + ... + 34657.

It is an arithmetic number, because the mean of its divisors is an integer number (1113840).

Almost surely, 2^30212728 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 30212728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35642880).

30212728 is an abundant number, since it is smaller than the sum of its proper divisors (41073032).

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

30212728 is a wasteful number, since it uses less digits than its factorization.

30212728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 30212728 is about 5496.6105919921. The cubic root of 30212728 is about 311.4559607335.

The spelling of 30212728 in words is "thirty million, two hundred twelve thousand, seven hundred twenty-eight".