78469815812 has 24 divisors (see below), whose sum is σ = 138080097792. Its totient is φ = 39018476000.

The previous prime is 78469815797. The next prime is 78469815817. The reversal of 78469815812 is 21851896487.

It is not an unprimeable number, because it can be changed into a prime (78469815817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3145187 + ... + 3170037.

It is an arithmetic number, because the mean of its divisors is an integer number (5753337408).

Almost surely, 2^78469815812 is an apocalyptic number.

It is an amenable number.

78469815812 is a deficient number, since it is larger than the sum of its proper divisors (59610281980).

78469815812 is a wasteful number, since it uses less digits than its factorization.

78469815812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29179 (or 29177 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 59.

The spelling of 78469815812 in words is "seventy-eight billion, four hundred sixty-nine million, eight hundred fifteen thousand, eight hundred twelve".