30661280 has 48 divisors (see below), whose sum is σ = 78014664. Its totient is φ = 11320320.

The previous prime is 30661273. The next prime is 30661283. The reversal of 30661280 is 8216603.

It can be written as a sum of positive squares in 4 ways, for example, as 27081616 + 3579664 = 5204^2 + 1892^2 .

It is a super-2 number, since 2×30661280² = 1880228182476800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (30661283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5291 + ... + 9450.

Almost surely, 2^30661280 is an apocalyptic number.

It is an amenable number.

30661280 is an abundant number, since it is smaller than the sum of its proper divisors (47353384).

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

30661280 is a wasteful number, since it uses less digits than its factorization.

30661280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14769 (or 14761 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 30661280 is about 5537.2628617395. The cubic root of 30661280 is about 312.9897345114.

Adding to 30661280 its reverse (8216603), we get a palindrome (38877883).

The spelling of 30661280 in words is "thirty million, six hundred sixty-one thousand, two hundred eighty".