306630640 has 40 divisors (see below), whose sum is σ = 714650688. Its totient is φ = 122353920.

The previous prime is 306630637. The next prime is 306630671. The reversal of 306630640 is 46036603.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 306630599 and 306630608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30034 + ... + 38926.

Almost surely, 2^306630640 is an apocalyptic number.

It is an amenable number.

306630640 is an abundant number, since it is smaller than the sum of its proper divisors (408020048).

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

306630640 is a wasteful number, since it uses less digits than its factorization.

306630640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9337 (or 9331 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 306630640 is about 17510.8720513857. The cubic root of 306630640 is about 674.3290195645.

The spelling of 306630640 in words is "three hundred six million, six hundred thirty thousand, six hundred forty".