7978166 has 8 divisors (see below), whose sum is σ = 13676880. Its totient is φ = 3419208.

The previous prime is 7978099. The next prime is 7978169. The reversal of 7978166 is 6618797.

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

It is a super-2 number, since 2×7978166² = 127302265447112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284921 + ... + 284948.

It is an arithmetic number, because the mean of its divisors is an integer number (1709610).

Almost surely, 2^7978166 is an apocalyptic number.

7978166 is a deficient number, since it is larger than the sum of its proper divisors (5698714).

7978166 is a wasteful number, since it uses less digits than its factorization.

7978166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569878.

The product of its digits is 127008, while the sum is 44.

The square root of 7978166 is about 2824.5647452307. The cubic root of 7978166 is about 199.8178842195.

The spelling of 7978166 in words is "seven million, nine hundred seventy-eight thousand, one hundred sixty-six".