30820688 has 10 divisors (see below), whose sum is σ = 59715114. Its totient is φ = 15410336.

The previous prime is 30820687. The next prime is 30820693. The reversal of 30820688 is 88602803.

It can be written as a sum of positive squares in only one way, i.e., 27164944 + 3655744 = 5212^2 + 1912^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30820687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 963131 + ... + 963162.

Almost surely, 2^30820688 is an apocalyptic number.

It is an amenable number.

30820688 is a deficient number, since it is larger than the sum of its proper divisors (28894426).

30820688 is a wasteful number, since it uses less digits than its factorization.

30820688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926301 (or 1926295 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 30820688 is about 5551.6383167494. The cubic root of 30820688 is about 313.5312084463.

The spelling of 30820688 in words is "thirty million, eight hundred twenty thousand, six hundred eighty-eight".