30771328 has 64 divisors (see below), whose sum is σ = 71334720. Its totient is φ = 12948480.

The previous prime is 30771287. The next prime is 30771347. The reversal of 30771328 is 82317703.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 30771328.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54375 + ... + 54937.

It is an arithmetic number, because the mean of its divisors is an integer number (1114605).

Almost surely, 2^30771328 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 30771328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35667360).

30771328 is an abundant number, since it is smaller than the sum of its proper divisors (40563392).

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

30771328 is an equidigital number, since it uses as much as digits as its factorization.

30771328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 30771328 is about 5547.1910008580. The cubic root of 30771328 is about 313.3637433389.

The spelling of 30771328 in words is "thirty million, seven hundred seventy-one thousand, three hundred twenty-eight".