306840640 has 28 divisors (see below), whose sum is σ = 730665036. Its totient is φ = 122736128.

The previous prime is 306840587. The next prime is 306840673. The reversal of 306840640 is 46048603.

It can be written as a sum of positive squares in 2 ways, for example, as 218330176 + 88510464 = 14776^2 + 9408^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479119 + ... + 479758.

Almost surely, 2^306840640 is an apocalyptic number.

It is an amenable number.

306840640 is an abundant number, since it is smaller than the sum of its proper divisors (423824396).

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

306840640 is an equidigital number, since it uses as much as digits as its factorization.

306840640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958894 (or 958884 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 306840640 is about 17516.8672998342. The cubic root of 306840640 is about 674.4829254481.

The spelling of 306840640 in words is "three hundred six million, eight hundred forty thousand, six hundred forty".