30720663 has 48 divisors (see below), whose sum is σ = 49870080. Its totient is φ = 18133632.

The previous prime is 30720647. The next prime is 30720667. The reversal of 30720663 is 36602703.

It is not a de Polignac number, because 30720663 - 2⁴ = 30720647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30720667) 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 47 ways as a sum of consecutive naturals, for example, 287056 + ... + 287162.

It is an arithmetic number, because the mean of its divisors is an integer number (1038960).

Almost surely, 2^30720663 is an apocalyptic number.

30720663 is a deficient number, since it is larger than the sum of its proper divisors (19149417).

30720663 is a wasteful number, since it uses less digits than its factorization.

30720663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 27.

The square root of 30720663 is about 5542.6223937772. The cubic root of 30720663 is about 313.1916643652.

The spelling of 30720663 in words is "thirty million, seven hundred twenty thousand, six hundred sixty-three".