78659161 has 15 divisors (see below), whose sum is σ = 92273343. Its totient is φ = 67049640.

The previous prime is 78659123. The next prime is 78659177. The reversal of 78659161 is 16195687.

It is a happy number.

The square root of 78659161 is 8869.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 77792400 = 931^2 + 8820^2 .

It is not a de Polignac number, because 78659161 - 2⁹ = 78658649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78659461) 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 14 ways as a sum of consecutive naturals, for example, 434491 + ... + 434671.

Almost surely, 2^78659161 is an apocalyptic number.

78659161 is the 8869-th square number.

78659161 is the 4435-th centered octagonal number.

It is an amenable number.

78659161 is a deficient number, since it is larger than the sum of its proper divisors (13614182).

78659161 is an frugal number, since it uses more digits than its factorization.

78659161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 188 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The cubic root of 78659161 is about 428.4660705194.

The spelling of 78659161 in words is "seventy-eight million, six hundred fifty-nine thousand, one hundred sixty-one".