2666278 has 4 divisors (see below), whose sum is σ = 3999420. Its totient is φ = 1333138.

The previous prime is 2666273. The next prime is 2666281. The reversal of 2666278 is 8726662.

2666278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 666568 + ... + 666571.

It is an arithmetic number, because the mean of its divisors is an integer number (999855).

2^2666278 is an apocalyptic number.

2666278 is a deficient number, since it is larger than the sum of its proper divisors (1333142).

2666278 is a wasteful number, since it uses less digits than its factorization.

2666278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333141.

The product of its digits is 48384, while the sum is 37.

The square root of 2666278 is about 1632.8741531422. The cubic root of 2666278 is about 138.6655173824.

The spelling of 2666278 in words is "two million, six hundred sixty-six thousand, two hundred seventy-eight".