78868866 has 16 divisors (see below), whose sum is σ = 158565888. Its totient is φ = 26151600.

The previous prime is 78868843. The next prime is 78868873. The reversal of 78868866 is 66886887.

It is a Curzon number.

It is a plaindrome in base 13.

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, 33265 + ... + 35556.

It is an arithmetic number, because the mean of its divisors is an integer number (9910368).

Almost surely, 2^78868866 is an apocalyptic number.

78868866 is an abundant number, since it is smaller than the sum of its proper divisors (79697022).

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

78868866 is a wasteful number, since it uses less digits than its factorization.

78868866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69017.

The product of its digits is 6193152, while the sum is 57.

The square root of 78868866 is about 8880.8144896738. The cubic root of 78868866 is about 428.8464955766.

The spelling of 78868866 in words is "seventy-eight million, eight hundred sixty-eight thousand, eight hundred sixty-six".