30120656 has 10 divisors (see below), whose sum is σ = 58358802. Its totient is φ = 15060320.

The previous prime is 30120613. The next prime is 30120667. The reversal of 30120656 is 65602103.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 5953600 = 4916^2 + 2440^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 941255 + ... + 941286.

Almost surely, 2^30120656 is an apocalyptic number.

It is an amenable number.

30120656 is a deficient number, since it is larger than the sum of its proper divisors (28238146).

30120656 is a wasteful number, since it uses less digits than its factorization.

30120656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882549 (or 1882543 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 30120656 is about 5488.2288582019. The cubic root of 30120656 is about 311.1392558816.

Adding to 30120656 its reverse (65602103), we get a palindrome (95722759).

The spelling of 30120656 in words is "thirty million, one hundred twenty thousand, six hundred fifty-six".