30928780 has 36 divisors (see below), whose sum is σ = 69008688. Its totient is φ = 11641600.

The previous prime is 30928771. The next prime is 30928783. The reversal of 30928780 is 8782903.

It is not an unprimeable number, because it can be changed into a prime (30928783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3105 + ... + 8455.

It is an arithmetic number, because the mean of its divisors is an integer number (1916908).

Almost surely, 2^30928780 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 30928780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34504344).

30928780 is an abundant number, since it is smaller than the sum of its proper divisors (38079908).

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

30928780 is a wasteful number, since it uses less digits than its factorization.

30928780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5394 (or 5375 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 30928780 is about 5561.3649403721. The cubic root of 30928780 is about 313.8973118173.

The spelling of 30928780 in words is "thirty million, nine hundred twenty-eight thousand, seven hundred eighty".