30720216 has 32 divisors (see below), whose sum is σ = 77088960. Its totient is φ = 10201632.

The previous prime is 30720199. The next prime is 30720247. The reversal of 30720216 is 61202703.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 30720192 and 30720201.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 4531 + ... + 9053.

It is an arithmetic number, because the mean of its divisors is an integer number (2409030).

Almost surely, 2^30720216 is an apocalyptic number.

It is an amenable number.

30720216 is an abundant number, since it is smaller than the sum of its proper divisors (46368744).

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

30720216 is a wasteful number, since it uses less digits than its factorization.

30720216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4815 (or 4811 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 30720216 is about 5542.5820697577. The cubic root of 30720216 is about 313.1901453295.

Adding to 30720216 its reverse (61202703), we get a palindrome (91922919).

The spelling of 30720216 in words is "thirty million, seven hundred twenty thousand, two hundred sixteen".