86709031778 has 4 divisors (see below), whose sum is σ = 130063547670. Its totient is φ = 43354515888.

The previous prime is 86709031699. The next prime is 86709031789. The reversal of 86709031778 is 87713090768.

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., 83837465209 + 2871566569 = 289547^2 + 53587^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21677257943 + ... + 21677257946.

Almost surely, 2^86709031778 is an apocalyptic number.

86709031778 is a deficient number, since it is larger than the sum of its proper divisors (43354515892).

86709031778 is a wasteful number, since it uses less digits than its factorization.

86709031778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43354515891.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 86709031778 in words is "eighty-six billion, seven hundred nine million, thirty-one thousand, seven hundred seventy-eight".