30720308 has 12 divisors (see below), whose sum is σ = 54365220. Its totient is φ = 15187392.

The previous prime is 30720307. The next prime is 30720331. The reversal of 30720308 is 80302703.

It can be written as a sum of positive squares in 2 ways, for example, as 2226064 + 28494244 = 1492^2 + 5338^2 .

It is a super-2 number, since 2×30720308² = 1887474647229728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30720307) 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 in 3 ways as a sum of consecutive naturals, for example, 42791 + ... + 43502.

It is an arithmetic number, because the mean of its divisors is an integer number (4530435).

Almost surely, 2^30720308 is an apocalyptic number.

It is an amenable number.

30720308 is a deficient number, since it is larger than the sum of its proper divisors (23644912).

30720308 is a wasteful number, since it uses less digits than its factorization.

30720308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86386 (or 86384 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 30720308 is about 5542.5903691325. The cubic root of 30720308 is about 313.1904579734.

The spelling of 30720308 in words is "thirty million, seven hundred twenty thousand, three hundred eight".