30728322 has 48 divisors (see below), whose sum is σ = 72072000. Its totient is φ = 9793872.

The previous prime is 30728293. The next prime is 30728381. The reversal of 30728322 is 22382703.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9804 + ... + 12552.

It is an arithmetic number, because the mean of its divisors is an integer number (1501500).

Almost surely, 2^30728322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30728322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36036000).

30728322 is an abundant number, since it is smaller than the sum of its proper divisors (41343678).

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

30728322 is a wasteful number, since it uses less digits than its factorization.

30728322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789 (or 2777 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 30728322 is about 5543.3132691559. The cubic root of 30728322 is about 313.2176895809.

The spelling of 30728322 in words is "thirty million, seven hundred twenty-eight thousand, three hundred twenty-two".