266978 has 8 divisors (see below), whose sum is σ = 403920. Its totient is φ = 132340.

The previous prime is 266977. The next prime is 266983. The reversal of 266978 is 879662.

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

It is not an unprimeable number, because it can be changed into a prime (266971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248 + ... + 771.

It is an arithmetic number, because the mean of its divisors is an integer number (50490).

2²⁶⁶⁹⁷⁸ is an apocalyptic number.

266978 is a deficient number, since it is larger than the sum of its proper divisors (136942).

266978 is a wasteful number, since it uses less digits than its factorization.

266978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its digits is 36288, while the sum is 38.

The square root of 266978 is about 516.6991387645. The cubic root of 266978 is about 64.3909983175.

It can be divided in two parts, 2 and 66978, that multiplied together give a square (133956 = 366²).

The spelling of 266978 in words is "two hundred sixty-six thousand, nine hundred seventy-eight".