78841646 has 16 divisors (see below), whose sum is σ = 129450048. Its totient is φ = 35791200.

The previous prime is 78841643. The next prime is 78841657. The reversal of 78841646 is 64614887.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78841597 and 78841606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78841643) 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, 23270 + ... + 26441.

It is an arithmetic number, because the mean of its divisors is an integer number (8090628).

Almost surely, 2^78841646 is an apocalyptic number.

78841646 is a deficient number, since it is larger than the sum of its proper divisors (50608402).

78841646 is a wasteful number, since it uses less digits than its factorization.

78841646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49787.

The product of its digits is 258048, while the sum is 44.

The square root of 78841646 is about 8879.2818403292. The cubic root of 78841646 is about 428.7971539907.

The spelling of 78841646 in words is "seventy-eight million, eight hundred forty-one thousand, six hundred forty-six".