78009388234 has 4 divisors (see below), whose sum is σ = 117014082354. Its totient is φ = 39004694116.

The previous prime is 78009388229. The next prime is 78009388243. The reversal of 78009388234 is 43288390087.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61356776209 + 16652612025 = 247703^2 + 129045^2 .

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 as a sum of consecutive naturals, namely, 19502347057 + ... + 19502347060.

Almost surely, 2^78009388234 is an apocalyptic number.

78009388234 is a deficient number, since it is larger than the sum of its proper divisors (39004694120).

78009388234 is a wasteful number, since it uses less digits than its factorization.

78009388234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39004694119.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 78009388234 in words is "seventy-eight billion, nine million, three hundred eighty-eight thousand, two hundred thirty-four".