78426806204778 has 16 divisors (see below), whose sum is σ = 156853719002496. Its totient is φ = 26142250969440.

The previous prime is 78426806204731. The next prime is 78426806204801. The reversal of 78426806204778 is 87740260862487.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7659750 + ... + 14680782.

It is an arithmetic number, because the mean of its divisors is an integer number (9803357437656).

Almost surely, 2^{78426806204778} is an apocalyptic number.

78426806204778 is an abundant number, since it is smaller than the sum of its proper divisors (78426912797718).

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

78426806204778 is a wasteful number, since it uses less digits than its factorization.

78426806204778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8882749.

The product of its (nonzero) digits is 404619264, while the sum is 69.

The spelling of 78426806204778 in words is "seventy-eight trillion, four hundred twenty-six billion, eight hundred six million, two hundred four thousand, seven hundred seventy-eight".