7863666 has 8 divisors (see below), whose sum is σ = 15727344. Its totient is φ = 2621220.

The previous prime is 7863643. The next prime is 7863671. The reversal of 7863666 is 6663687.

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

7863666 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655300 + ... + 655311.

It is an arithmetic number, because the mean of its divisors is an integer number (1965918).

Almost surely, 2^7863666 is an apocalyptic number.

7863666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7863666 is a wasteful number, since it uses less digits than its factorization.

7863666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310616.

The product of its digits is 217728, while the sum is 42.

The square root of 7863666 is about 2804.2228870045. Note that the first 3 decimals coincide. The cubic root of 7863666 is about 198.8573677226.

The spelling of 7863666 in words is "seven million, eight hundred sixty-three thousand, six hundred sixty-six".