78771856 has 20 divisors (see below), whose sum is σ = 153722800. Its totient is φ = 39101472.

The previous prime is 78771839. The next prime is 78771881. The reversal of 78771856 is 65817787.

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 3 ways as a sum of consecutive naturals, for example, 15486 + ... + 19933.

It is an arithmetic number, because the mean of its divisors is an integer number (7686140).

Almost surely, 2^78771856 is an apocalyptic number.

It is an amenable number.

78771856 is a deficient number, since it is larger than the sum of its proper divisors (74950944).

78771856 is a wasteful number, since it uses less digits than its factorization.

78771856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35566 (or 35560 counting only the distinct ones).

The product of its digits is 658560, while the sum is 49.

The square root of 78771856 is about 8875.3510353112. The cubic root of 78771856 is about 428.6705940263.

The spelling of 78771856 in words is "seventy-eight million, seven hundred seventy-one thousand, eight hundred fifty-six".