78936742405 has 8 divisors (see below), whose sum is σ = 95661953784. Its totient is φ = 62524152000.

The previous prime is 78936742397. The next prime is 78936742439. The reversal of 78936742405 is 50424763987.

It can be written as a sum of positive squares in 4 ways, for example, as 6046462081 + 72890280324 = 77759^2 + 269982^2 .

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

It is not a de Polignac number, because 78936742405 - 2³ = 78936742397 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 78154686 + ... + 78155695.

It is an arithmetic number, because the mean of its divisors is an integer number (11957744223).

Almost surely, 2^78936742405 is an apocalyptic number.

It is an amenable number.

78936742405 is a deficient number, since it is larger than the sum of its proper divisors (16725211379).

78936742405 is a wasteful number, since it uses less digits than its factorization.

78936742405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156310487.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 78936742405 in words is "seventy-eight billion, nine hundred thirty-six million, seven hundred forty-two thousand, four hundred five".