7728666 has 16 divisors (see below), whose sum is σ = 16862688. Its totient is φ = 2342000.

The previous prime is 7728647. The next prime is 7728673. The reversal of 7728666 is 6668277.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58485 + ... + 58616.

It is an arithmetic number, because the mean of its divisors is an integer number (1053918).

Almost surely, 2^7728666 is an apocalyptic number.

7728666 is an abundant number, since it is smaller than the sum of its proper divisors (9134022).

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

7728666 is a wasteful number, since it uses less digits than its factorization.

7728666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117117.

The product of its digits is 169344, while the sum is 42.

The square root of 7728666 is about 2780.0478413150. The cubic root of 7728666 is about 197.7128272419.

The spelling of 7728666 in words is "seven million, seven hundred twenty-eight thousand, six hundred sixty-six".