305403442640 has 40 divisors (see below), whose sum is σ = 710869142088. Its totient is φ = 122022686720.

The previous prime is 305403442639. The next prime is 305403442693. The reversal of 305403442640 is 46244304503.

It can be written as a sum of positive squares in 4 ways, for example, as 7186970176 + 298216472464 = 84776^2 + 546092^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 305403442640.

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, 2096117 + ... + 2237076.

Almost surely, 2^305403442640 is an apocalyptic number.

It is an amenable number.

305403442640 is an abundant number, since it is smaller than the sum of its proper divisors (405465699448).

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

305403442640 is a wasteful number, since it uses less digits than its factorization.

305403442640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334087 (or 4334081 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 35.

The spelling of 305403442640 in words is "three hundred five billion, four hundred three million, four hundred forty-two thousand, six hundred forty".