78888161 has 4 divisors (see below), whose sum is σ = 86059824. Its totient is φ = 71716500.

The previous prime is 78888151. The next prime is 78888163. The reversal of 78888161 is 16188887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78888161 - 2¹⁸ = 78626017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78888163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3585815 + ... + 3585836.

It is an arithmetic number, because the mean of its divisors is an integer number (21514956).

Almost surely, 2^78888161 is an apocalyptic number.

It is an amenable number.

78888161 is a deficient number, since it is larger than the sum of its proper divisors (7171663).

78888161 is a wasteful number, since it uses less digits than its factorization.

78888161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7171662.

The product of its digits is 172032, while the sum is 47.

The square root of 78888161 is about 8881.9007537801. The cubic root of 78888161 is about 428.8814646709.

The spelling of 78888161 in words is "seventy-eight million, eight hundred eighty-eight thousand, one hundred sixty-one".