30915280 has 120 divisors (see below), whose sum is σ = 84503520. Its totient is φ = 10402560.

The previous prime is 30915263. The next prime is 30915329. The reversal of 30915280 is 8251903.

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, 718939 + ... + 718981.

It is an arithmetic number, because the mean of its divisors is an integer number (704196).

Almost surely, 2^30915280 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 30915280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42251760).

30915280 is an abundant number, since it is smaller than the sum of its proper divisors (53588240).

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

30915280 is a wasteful number, since it uses less digits than its factorization.

30915280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 30915280 is about 5560.1510770841. The cubic root of 30915280 is about 313.8516345074.

The spelling of 30915280 in words is "thirty million, nine hundred fifteen thousand, two hundred eighty".