306720644 has 12 divisors (see below), whose sum is σ = 537705168. Its totient is φ = 153090600.

The previous prime is 306720643. The next prime is 306720691. The reversal of 306720644 is 446027603.

It is a self number, because there is not a number n which added to its sum of digits gives 306720644.

It is not an unprimeable number, because it can be changed into a prime (306720643) 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, 64862 + ... + 69429.

It is an arithmetic number, because the mean of its divisors is an integer number (44808764).

Almost surely, 2^306720644 is an apocalyptic number.

It is an amenable number.

306720644 is a deficient number, since it is larger than the sum of its proper divisors (230984524).

306720644 is a wasteful number, since it uses less digits than its factorization.

306720644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134866 (or 134864 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 306720644 is about 17513.4418090791. The cubic root of 306720644 is about 674.3949907623.

The spelling of 306720644 in words is "three hundred six million, seven hundred twenty thousand, six hundred forty-four".