306370640 has 20 divisors (see below), whose sum is σ = 712311924. Its totient is φ = 122548224.

The previous prime is 306370633. The next prime is 306370643. The reversal of 306370640 is 46073603.

It can be written as a sum of positive squares in 2 ways, for example, as 185722384 + 120648256 = 13628^2 + 10984^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306370643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1914737 + ... + 1914896.

Almost surely, 2^306370640 is an apocalyptic number.

It is an amenable number.

306370640 is an abundant number, since it is smaller than the sum of its proper divisors (405941284).

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

306370640 is a wasteful number, since it uses less digits than its factorization.

306370640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829646 (or 3829640 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 306370640 is about 17503.4465177576. The cubic root of 306370640 is about 674.1383720341.

The spelling of 306370640 in words is "three hundred six million, three hundred seventy thousand, six hundred forty".