86680322978 has 18 divisors (see below), whose sum is σ = 137236360401. Its totient is φ = 41055353064.

The previous prime is 86680322941. The next prime is 86680322999. The reversal of 86680322978 is 87922308668.

It can be written as a sum of positive squares in 2 ways, for example, as 85359218569 + 1321104409 = 292163^2 + 36347^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=208183.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7905476 + ... + 7916432.

Almost surely, 2^86680322978 is an apocalyptic number.

86680322978 is a deficient number, since it is larger than the sum of its proper divisors (50556037423).

86680322978 is an frugal number, since it uses more digits than its factorization.

86680322978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21954 (or 10978 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 86680322978 in words is "eighty-six billion, six hundred eighty million, three hundred twenty-two thousand, nine hundred seventy-eight".