306640244 has 24 divisors (see below), whose sum is σ = 544360320. Its totient is φ = 151119936.

The previous prime is 306640241. The next prime is 306640249. The reversal of 306640244 is 442046603.

306640244 = 1812² + 1813² + ... + 1900².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306640241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129479 + ... + 131825.

It is an arithmetic number, because the mean of its divisors is an integer number (22681680).

Almost surely, 2^306640244 is an apocalyptic number.

It is an amenable number.

306640244 is a deficient number, since it is larger than the sum of its proper divisors (237720076).

306640244 is a wasteful number, since it uses less digits than its factorization.

306640244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807 (or 2805 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 306640244 is about 17511.1462788705. The cubic root of 306640244 is about 674.3360597267.

Adding to 306640244 its reverse (442046603), we get a palindrome (748686847).

The spelling of 306640244 in words is "three hundred six million, six hundred forty thousand, two hundred forty-four".