7666979 has 4 divisors (see below), whose sum is σ = 7709520. Its totient is φ = 7624440.

The previous prime is 7666973. The next prime is 7666993. The reversal of 7666979 is 9796667.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 7666979 - 2¹⁶ = 7601443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7666973) 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, 20999 + ... + 21360.

It is an arithmetic number, because the mean of its divisors is an integer number (1927380).

Almost surely, 2^7666979 is an apocalyptic number.

7666979 is a deficient number, since it is larger than the sum of its proper divisors (42541).

7666979 is a wasteful number, since it uses less digits than its factorization.

7666979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42540.

The product of its digits is 857304, while the sum is 50.

The square root of 7666979 is about 2768.9310211704. The cubic root of 7666979 is about 197.1854009712.

The spelling of 7666979 in words is "seven million, six hundred sixty-six thousand, nine hundred seventy-nine".