30561280 has 88 divisors (see below), whose sum is σ = 75460608. Its totient is φ = 11870208.

The previous prime is 30561269. The next prime is 30561281. The reversal of 30561280 is 8216503.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30561281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240577 + ... + 240703.

Almost surely, 2^30561280 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 30561280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37730304).

30561280 is an abundant number, since it is smaller than the sum of its proper divisors (44899328).

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

30561280 is a wasteful number, since it uses less digits than its factorization.

30561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 30561280 is about 5528.2257551587. The cubic root of 30561280 is about 312.6490979187.

Adding to 30561280 its reverse (8216503), we get a palindrome (38777783).

The spelling of 30561280 in words is "thirty million, five hundred sixty-one thousand, two hundred eighty".