78698161 has 8 divisors (see below), whose sum is σ = 80679240. Its totient is φ = 76741632.

The previous prime is 78698107. The next prime is 78698167. The reversal of 78698161 is 16189687.

It can be written as a sum of positive squares in 4 ways, for example, as 2030625 + 76667536 = 1425^2 + 8756^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78698161 - 2¹¹ = 78696113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78698167) 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, 441 + ... + 12553.

It is an arithmetic number, because the mean of its divisors is an integer number (10084905).

Almost surely, 2^78698161 is an apocalyptic number.

It is an amenable number.

78698161 is a deficient number, since it is larger than the sum of its proper divisors (1981079).

78698161 is a wasteful number, since it uses less digits than its factorization.

78698161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12275.

The product of its digits is 145152, while the sum is 46.

The square root of 78698161 is about 8871.1983970600. The cubic root of 78698161 is about 428.5368714094.

The spelling of 78698161 in words is "seventy-eight million, six hundred ninety-eight thousand, one hundred sixty-one".