305212640 has 48 divisors (see below), whose sum is σ = 722729952. Its totient is φ = 121803264.

The previous prime is 305212631. The next prime is 305212657. The reversal of 305212640 is 46212503.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 75962 + ... + 79878.

It is an arithmetic number, because the mean of its divisors is an integer number (15056874).

Almost surely, 2^305212640 is an apocalyptic number.

It is an amenable number.

305212640 is an abundant number, since it is smaller than the sum of its proper divisors (417517312).

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

305212640 is a wasteful number, since it uses less digits than its factorization.

305212640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419 (or 4411 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 305212640 is about 17470.3360013481. The cubic root of 305212640 is about 673.2879447452.

The spelling of 305212640 in words is "three hundred five million, two hundred twelve thousand, six hundred forty".