78465838778 has 8 divisors (see below), whose sum is σ = 117702060960. Its totient is φ = 39231818460.

The previous prime is 78465838769. The next prime is 78465838783. The reversal of 78465838778 is 87783856487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458288 + ... + 605771.

It is an arithmetic number, because the mean of its divisors is an integer number (14712757620).

Almost surely, 2^78465838778 is an apocalyptic number.

78465838778 is a deficient number, since it is larger than the sum of its proper divisors (39236222182).

78465838778 is a wasteful number, since it uses less digits than its factorization.

78465838778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100932.

The product of its digits is 505774080, while the sum is 71.

The spelling of 78465838778 in words is "seventy-eight billion, four hundred sixty-five million, eight hundred thirty-eight thousand, seven hundred seventy-eight".