86709031779 has 4 divisors (see below), whose sum is σ = 115612042376. Its totient is φ = 57806021184.

The previous prime is 86709031699. The next prime is 86709031789. The reversal of 86709031779 is 97713090768.

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

It is not a de Polignac number, because 86709031779 - 2¹⁹ = 86708507491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86709031789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14451505294 + ... + 14451505299.

It is an arithmetic number, because the mean of its divisors is an integer number (28903010594).

Almost surely, 2^86709031779 is an apocalyptic number.

86709031779 is a deficient number, since it is larger than the sum of its proper divisors (28903010597).

86709031779 is a wasteful number, since it uses less digits than its factorization.

86709031779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28903010596.

The product of its (nonzero) digits is 4000752, while the sum is 57.

The spelling of 86709031779 in words is "eighty-six billion, seven hundred nine million, thirty-one thousand, seven hundred seventy-nine".