7278166 has 24 divisors (see below), whose sum is σ = 13255920. Its totient is φ = 2982672.

The previous prime is 7278157. The next prime is 7278199. The reversal of 7278166 is 6618727.

7278166 = 4² + 5² + ... + 279².

It is a happy number.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640 + ... + 3868.

It is an arithmetic number, because the mean of its divisors is an integer number (552330).

Almost surely, 2^7278166 is an apocalyptic number.

7278166 is a deficient number, since it is larger than the sum of its proper divisors (5977754).

7278166 is a wasteful number, since it uses less digits than its factorization.

7278166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3268 (or 3261 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 7278166 is about 2697.8076284272. The cubic root of 7278166 is about 193.7941451959.

The spelling of 7278166 in words is "seven million, two hundred seventy-eight thousand, one hundred sixty-six".