306028240 has 40 divisors (see below), whose sum is σ = 813162240. Its totient is φ = 104923776.

The previous prime is 306028207. The next prime is 306028241. The reversal of 306028240 is 42820603.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306028241) 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, 272680 + ... + 273799.

It is an arithmetic number, because the mean of its divisors is an integer number (20329056).

Almost surely, 2^306028240 is an apocalyptic number.

It is an amenable number.

306028240 is an abundant number, since it is smaller than the sum of its proper divisors (507134000).

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

306028240 is a wasteful number, since it uses less digits than its factorization.

306028240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546499 (or 546493 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 306028240 is about 17493.6628525875. The cubic root of 306028240 is about 673.8871392767.

Adding to 306028240 its reverse (42820603), we get a palindrome (348848843).

The spelling of 306028240 in words is "three hundred six million, twenty-eight thousand, two hundred forty".