78966844 has 24 divisors (see below), whose sum is σ = 150990336. Its totient is φ = 35838000.

The previous prime is 78966841. The next prime is 78966893. The reversal of 78966844 is 44866987.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 78966791 and 78966800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78966841) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42699 + ... + 44509.

It is an arithmetic number, because the mean of its divisors is an integer number (6291264).

Almost surely, 2^78966844 is an apocalyptic number.

It is an amenable number.

78966844 is a deficient number, since it is larger than the sum of its proper divisors (72023492).

78966844 is a wasteful number, since it uses less digits than its factorization.

78966844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817 (or 2815 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 78966844 is about 8886.3290508511. The cubic root of 78966844 is about 429.0240059883.

The spelling of 78966844 in words is "seventy-eight million, nine hundred sixty-six thousand, eight hundred forty-four".