80866 has 4 divisors (see below), whose sum is σ = 121302. Its totient is φ = 40432.

The previous prime is 80863. The next prime is 80897. The reversal of 80866 is 66808.

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., 77841 + 3025 = 279^2 + 55^2 .

It is not an unprimeable number, because it can be changed into a prime (80863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20215 + ... + 20218.

2⁸⁰⁸⁶⁶ is an apocalyptic number.

80866 is a deficient number, since it is larger than the sum of its proper divisors (40436).

80866 is a wasteful number, since it uses less digits than its factorization.

80866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40435.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 80866 is about 284.3694779684. The cubic root of 80866 is about 43.2436145027.

It can be divided in two parts, 8086 and 6, that multiplied together give a triangular number (48516 = T₃₁₁).

The spelling of 80866 in words is "eighty thousand, eight hundred sixty-six".