78510475305 has 12 divisors (see below), whose sum is σ = 136084823940. Its totient is φ = 41872253472.

The previous prime is 78510475297. The next prime is 78510475391. The reversal of 78510475305 is 50357401587.

It is a happy number.

78510475305 is a `hidden beast` number, since 7 + 8 + 5 + 104 + 7 + 530 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13042553616 + 65467921689 = 114204^2 + 255867^2 .

It is not a de Polignac number, because 78510475305 - 2³ = 78510475297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1744677229 = 78510475305 / (7 + 8 + 5 + 1 + 0 + 4 + 7 + 5 + 3 + 0 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 872338570 + ... + 872338659.

It is an arithmetic number, because the mean of its divisors is an integer number (11340401995).

Almost surely, 2^78510475305 is an apocalyptic number.

It is an amenable number.

78510475305 is a deficient number, since it is larger than the sum of its proper divisors (57574348635).

78510475305 is a wasteful number, since it uses less digits than its factorization.

78510475305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744677240 (or 1744677237 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 45.

The spelling of 78510475305 in words is "seventy-eight billion, five hundred ten million, four hundred seventy-five thousand, three hundred five".