308640330 has 48 divisors (see below), whose sum is σ = 830143080. Its totient is φ = 79465344.

The previous prime is 308640317. The next prime is 308640331. The reversal of 308640330 is 33046803.

It can be written as a sum of positive squares in 4 ways, for example, as 259822161 + 48818169 = 16119^2 + 6987^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 308640294 and 308640303.

It is not an unprimeable number, because it can be changed into a prime (308640331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56517 + ... + 61736.

Almost surely, 2^308640330 is an apocalyptic number.

308640330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

308640330 is an abundant number, since it is smaller than the sum of its proper divisors (521502750).

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

308640330 is a wasteful number, since it uses less digits than its factorization.

308640330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118295 (or 118292 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 308640330 is about 17568.1623967904. The cubic root of 308640330 is about 675.7990208763.

The spelling of 308640330 in words is "three hundred eight million, six hundred forty thousand, three hundred thirty".