30528780 has 48 divisors (see below), whose sum is σ = 86456160. Its totient is φ = 8048128.

The previous prime is 30528761. The next prime is 30528809. The reversal of 30528780 is 8782503.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2482 + ... + 8198.

It is an arithmetic number, because the mean of its divisors is an integer number (1801170).

Almost surely, 2^30528780 is an apocalyptic number.

30528780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30528780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43228080).

30528780 is an abundant number, since it is smaller than the sum of its proper divisors (55927380).

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

30528780 is a wasteful number, since it uses less digits than its factorization.

30528780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5818 (or 5816 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 30528780 is about 5525.2855129848. The cubic root of 30528780 is about 312.5382310560.

The spelling of 30528780 in words is "thirty million, five hundred twenty-eight thousand, seven hundred eighty".