78561822 has 16 divisors (see below), whose sum is σ = 160956432. Its totient is φ = 25548480.

The previous prime is 78561803. The next prime is 78561823. The reversal of 78561822 is 22816587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78561823) 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, 159433 + ... + 159924.

It is an arithmetic number, because the mean of its divisors is an integer number (10059777).

Almost surely, 2^78561822 is an apocalyptic number.

78561822 is an abundant number, since it is smaller than the sum of its proper divisors (82394610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78561822 is a wasteful number, since it uses less digits than its factorization.

78561822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319403.

The product of its digits is 53760, while the sum is 39.

The square root of 78561822 is about 8863.5107040044. The cubic root of 78561822 is about 428.2892584195.

The spelling of 78561822 in words is "seventy-eight million, five hundred sixty-one thousand, eight hundred twenty-two".