30561056 has 24 divisors (see below), whose sum is σ = 61190640. Its totient is φ = 15020608.

The previous prime is 30561049. The next prime is 30561067. The reversal of 30561056 is 65016503.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6206 + ... + 9981.

It is an arithmetic number, because the mean of its divisors is an integer number (2549610).

Almost surely, 2^30561056 is an apocalyptic number.

It is an amenable number.

30561056 is an abundant number, since it is smaller than the sum of its proper divisors (30629584).

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

30561056 is a wasteful number, since it uses less digits than its factorization.

30561056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16256 (or 16248 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 30561056 is about 5528.2054954569. The cubic root of 30561056 is about 312.6483340593.

Adding to 30561056 its reverse (65016503), we get a palindrome (95577559).

The spelling of 30561056 in words is "thirty million, five hundred sixty-one thousand, fifty-six".