4278566 has 4 divisors (see below), whose sum is σ = 6417852. Its totient is φ = 2139282.

The previous prime is 4278563. The next prime is 4278607. The reversal of 4278566 is 6658724.

It is a happy number.

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

It is a super-2 number, since 2×4278566² = 36612254032712, which contains 22 as substring.

It is a d-powerful number, because it can be written as 4¹¹ + 2¹⁵ + 7² + 8⁵ + 5⁵ + 6⁵ + 6⁵ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069640 + ... + 1069643.

It is an arithmetic number, because the mean of its divisors is an integer number (1604463).

Almost surely, 2^4278566 is an apocalyptic number.

4278566 is a deficient number, since it is larger than the sum of its proper divisors (2139286).

4278566 is a wasteful number, since it uses less digits than its factorization.

4278566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139285.

The product of its digits is 80640, while the sum is 38.

The square root of 4278566 is about 2068.4694824918. The cubic root of 4278566 is about 162.3426927391.

The spelling of 4278566 in words is "four million, two hundred seventy-eight thousand, five hundred sixty-six".