78719812 has 24 divisors (see below), whose sum is σ = 145322240. Its totient is φ = 37208160.

The previous prime is 78719801. The next prime is 78719867. The reversal of 78719812 is 21891787.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49453 + ... + 51019.

Almost surely, 2^78719812 is an apocalyptic number.

It is an amenable number.

78719812 is a deficient number, since it is larger than the sum of its proper divisors (66602428).

78719812 is a wasteful number, since it uses less digits than its factorization.

78719812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251 (or 2249 counting only the distinct ones).

The product of its digits is 56448, while the sum is 43.

The square root of 78719812 is about 8872.4186105030. The cubic root of 78719812 is about 428.5761666989.

The spelling of 78719812 in words is "seventy-eight million, seven hundred nineteen thousand, eight hundred twelve".