78815315910 has 32 divisors (see below), whose sum is σ = 191106834912. Its totient is φ = 20800742400.

The previous prime is 78815315863. The next prime is 78815315951. The reversal of 78815315910 is 1951351887.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78815315910.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13539241 + ... + 13545060.

It is an arithmetic number, because the mean of its divisors is an integer number (5972088591).

Almost surely, 2^78815315910 is an apocalyptic number.

78815315910 is an abundant number, since it is smaller than the sum of its proper divisors (112291519002).

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

78815315910 is a wasteful number, since it uses less digits than its factorization.

78815315910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27084408.

The product of its (nonzero) digits is 302400, while the sum is 48.

The spelling of 78815315910 in words is "seventy-eight billion, eight hundred fifteen million, three hundred fifteen thousand, nine hundred ten".