78466 has 4 divisors (see below), whose sum is σ = 117702. Its totient is φ = 39232.

The previous prime is 78439. The next prime is 78467. The reversal of 78466 is 66487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66487 = 17 ⋅3911.

It can be written as a sum of positive squares in only one way, i.e., 77841 + 625 = 279^2 + 25^2 .

It is not an unprimeable number, because it can be changed into a prime (78467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19615 + ... + 19618.

2⁷⁸⁴⁶⁶ is an apocalyptic number.

78466 is a deficient number, since it is larger than the sum of its proper divisors (39236).

78466 is a wasteful number, since it uses less digits than its factorization.

78466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39235.

The product of its digits is 8064, while the sum is 31.

The square root of 78466 is about 280.1178323492. The cubic root of 78466 is about 42.8115059176.

The spelling of 78466 in words is "seventy-eight thousand, four hundred sixty-six".