78781598734 has 4 divisors (see below), whose sum is σ = 118172398104. Its totient is φ = 39390799366.

The previous prime is 78781598717. The next prime is 78781598771. The reversal of 78781598734 is 43789518787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43789518787 = 7 ⋅6255645541.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 78781598734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19695399682 + ... + 19695399685.

It is an arithmetic number, because the mean of its divisors is an integer number (29543099526).

Almost surely, 2^78781598734 is an apocalyptic number.

78781598734 is a deficient number, since it is larger than the sum of its proper divisors (39390799370).

78781598734 is a wasteful number, since it uses less digits than its factorization.

78781598734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39390799369.

The product of its digits is 94832640, while the sum is 67.

The spelling of 78781598734 in words is "seventy-eight billion, seven hundred eighty-one million, five hundred ninety-eight thousand, seven hundred thirty-four".