78851684 has 12 divisors (see below), whose sum is σ = 138066684. Its totient is φ = 39404064.

The previous prime is 78851683. The next prime is 78851687. The reversal of 78851684 is 48615887.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39438400 + 39413284 = 6280^2 + 6278^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78851683) 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 3 ways as a sum of consecutive naturals, for example, 4874 + ... + 13470.

It is an arithmetic number, because the mean of its divisors is an integer number (11505557).

Almost surely, 2^78851684 is an apocalyptic number.

It is an amenable number.

78851684 is a deficient number, since it is larger than the sum of its proper divisors (59215000).

78851684 is a wasteful number, since it uses less digits than its factorization.

78851684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10894 (or 10892 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 78851684 is about 8879.8470707552. The cubic root of 78851684 is about 428.8153511550.

The spelling of 78851684 in words is "seventy-eight million, eight hundred fifty-one thousand, six hundred eighty-four".