30720306 has 8 divisors (see below), whose sum is σ = 61440624. Its totient is φ = 10240100.

The previous prime is 30720299. The next prime is 30720307. The reversal of 30720306 is 60302703.

It is a sphenic number, since it is the product of 3 distinct primes.

30720306 is an admirable 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, 2560020 + ... + 2560031.

It is an arithmetic number, because the mean of its divisors is an integer number (7680078).

Almost surely, 2^30720306 is an apocalyptic number.

30720306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

30720306 is a wasteful number, since it uses less digits than its factorization.

30720306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120056.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 30720306 is about 5542.5901887114. The cubic root of 30720306 is about 313.1904511768.

The spelling of 30720306 in words is "thirty million, seven hundred twenty thousand, three hundred six".