78597734905 has 4 divisors (see below), whose sum is σ = 94317281892. Its totient is φ = 62878187920.

The previous prime is 78597734903. The next prime is 78597734927. The reversal of 78597734905 is 50943779587.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37068185961 + 41529548944 = 192531^2 + 203788^2 .

It is not a de Polignac number, because 78597734905 - 2¹ = 78597734903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78597734903) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7859773486 + ... + 7859773495.

It is an arithmetic number, because the mean of its divisors is an integer number (23579320473).

Almost surely, 2^78597734905 is an apocalyptic number.

It is an amenable number.

78597734905 is a deficient number, since it is larger than the sum of its proper divisors (15719546987).

78597734905 is a wasteful number, since it uses less digits than its factorization.

78597734905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15719546986.

The product of its (nonzero) digits is 66679200, while the sum is 64.

The spelling of 78597734905 in words is "seventy-eight billion, five hundred ninety-seven million, seven hundred thirty-four thousand, nine hundred five".