78891212 has 18 divisors (see below), whose sum is σ = 139030164. Its totient is φ = 39170040.

The previous prime is 78891209. The next prime is 78891221. The reversal of 78891212 is 21219887.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177863 + ... + 178305.

It is an arithmetic number, because the mean of its divisors is an integer number (7723898).

Almost surely, 2^78891212 is an apocalyptic number.

It is an amenable number.

78891212 is a deficient number, since it is larger than the sum of its proper divisors (60138952).

78891212 is a wasteful number, since it uses less digits than its factorization.

78891212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 656 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 78891212 is about 8882.0725058964. The cubic root of 78891212 is about 428.8869935972.

The spelling of 78891212 in words is "seventy-eight million, eight hundred ninety-one thousand, two hundred twelve".