307530640 has 20 divisors (see below), whose sum is σ = 715008924. Its totient is φ = 123012224.

The previous prime is 307530617. The next prime is 307530673. The reversal of 307530640 is 46035703.

It can be written as a sum of positive squares in 2 ways, for example, as 93083904 + 214446736 = 9648^2 + 14644^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 307530599 and 307530608.

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 3 ways as a sum of consecutive naturals, for example, 1921987 + ... + 1922146.

Almost surely, 2^307530640 is an apocalyptic number.

It is an amenable number.

307530640 is an abundant number, since it is smaller than the sum of its proper divisors (407478284).

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

307530640 is a wasteful number, since it uses less digits than its factorization.

307530640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844146 (or 3844140 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 307530640 is about 17536.5515424213. The cubic root of 307530640 is about 674.9881223333.

The spelling of 307530640 in words is "three hundred seven million, five hundred thirty thousand, six hundred forty".