86978566 has 8 divisors (see below), whose sum is σ = 130976280. Its totient is φ = 43319808.

The previous prime is 86978539. The next prime is 86978581. The reversal of 86978566 is 66587968.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84096 + ... + 85123.

It is an arithmetic number, because the mean of its divisors is an integer number (16372035).

Almost surely, 2^86978566 is an apocalyptic number.

86978566 is a deficient number, since it is larger than the sum of its proper divisors (43997714).

86978566 is a wasteful number, since it uses less digits than its factorization.

86978566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169478.

The product of its digits is 4354560, while the sum is 55.

The square root of 86978566 is about 9326.2299993084. The cubic root of 86978566 is about 443.0683702631.

The spelling of 86978566 in words is "eighty-six million, nine hundred seventy-eight thousand, five hundred sixty-six".