78722166 has 16 divisors (see below), whose sum is σ = 160113600. Its totient is φ = 25795848.

The previous prime is 78722159. The next prime is 78722167. The reversal of 78722166 is 66122787.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78722167) 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, 110836 + ... + 111543.

It is an arithmetic number, because the mean of its divisors is an integer number (10007100).

Almost surely, 2^78722166 is an apocalyptic number.

78722166 is an abundant number, since it is smaller than the sum of its proper divisors (81391434).

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

78722166 is a wasteful number, since it uses less digits than its factorization.

78722166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222443.

The product of its digits is 56448, while the sum is 39.

The square root of 78722166 is about 8872.5512678147. The cubic root of 78722166 is about 428.5804386360.

The spelling of 78722166 in words is "seventy-eight million, seven hundred twenty-two thousand, one hundred sixty-six".