7285666 has 4 divisors (see below), whose sum is σ = 10928502. Its totient is φ = 3642832.

The previous prime is 7285661. The next prime is 7285679. The reversal of 7285666 is 6665827.

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

It can be written as a sum of positive squares in only one way, i.e., 6869641 + 416025 = 2621^2 + 645^2 .

It is not an unprimeable number, because it can be changed into a prime (7285661) by changing a digit.

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 as a sum of consecutive naturals, namely, 1821415 + ... + 1821418.

Almost surely, 2^7285666 is an apocalyptic number.

7285666 is a deficient number, since it is larger than the sum of its proper divisors (3642836).

7285666 is a wasteful number, since it uses less digits than its factorization.

7285666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642835.

The product of its digits is 120960, while the sum is 40.

The square root of 7285666 is about 2699.1972880840. The cubic root of 7285666 is about 193.8606893006.

The spelling of 7285666 in words is "seven million, two hundred eighty-five thousand, six hundred sixty-six".