78266 has 4 divisors (see below), whose sum is σ = 117402. Its totient is φ = 39132.

The previous prime is 78259. The next prime is 78277. The reversal of 78266 is 66287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66287 = 13 ⋅5099.

It can be written as a sum of positive squares in only one way, i.e., 46225 + 32041 = 215^2 + 179^2 .

It is a super-2 number, since 2×78266² = 12251133512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19565 + ... + 19568.

2⁷⁸²⁶⁶ is an apocalyptic number.

78266 is a deficient number, since it is larger than the sum of its proper divisors (39136).

78266 is a wasteful number, since it uses less digits than its factorization.

78266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39135.

The product of its digits is 4032, while the sum is 29.

The square root of 78266 is about 279.7606119524. The cubic root of 78266 is about 42.7751012487.

It can be divided in two parts, 782 and 66, that added together give a palindrome (848).

The spelling of 78266 in words is "seventy-eight thousand, two hundred sixty-six".