78166 has 24 divisors (see below), whose sum is σ = 143640. Its totient is φ = 31680.

The previous prime is 78163. The next prime is 78167. The reversal of 78166 is 66187.

It is a super-2 number, since 2×78166² = 12219847112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4105 + ... + 4123.

It is an arithmetic number, because the mean of its divisors is an integer number (5985).

2⁷⁸¹⁶⁶ is an apocalyptic number.

78166 is a deficient number, since it is larger than the sum of its proper divisors (65474).

78166 is a wasteful number, since it uses less digits than its factorization.

78166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 49 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 78166 is about 279.5818305971. The cubic root of 78166 is about 42.7568756539.

The spelling of 78166 in words is "seventy-eight thousand, one hundred sixty-six".