78820809385 has 16 divisors (see below), whose sum is σ = 95469454080. Its totient is φ = 62469645120.

The previous prime is 78820809367. The next prime is 78820809391. The reversal of 78820809385 is 58390802887.

It is not a de Polignac number, because 78820809385 - 2²¹ = 78818712233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72436 + ... + 403594.

It is an arithmetic number, because the mean of its divisors is an integer number (5966840880).

Almost surely, 2^78820809385 is an apocalyptic number.

It is an amenable number.

78820809385 is a deficient number, since it is larger than the sum of its proper divisors (16648644695).

78820809385 is a wasteful number, since it uses less digits than its factorization.

78820809385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331608.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 78820809385 in words is "seventy-eight billion, eight hundred twenty million, eight hundred nine thousand, three hundred eighty-five".