78985089 has 6 divisors (see below), whose sum is σ = 114089586. Its totient is φ = 52656720.

The previous prime is 78985087. The next prime is 78985103. The reversal of 78985089 is 98058987.

It can be written as a sum of positive squares in only one way, i.e., 77580864 + 1404225 = 8808^2 + 1185^2 .

It is not a de Polignac number, because 78985089 - 2¹ = 78985087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78985087) 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 5 ways as a sum of consecutive naturals, for example, 4388052 + ... + 4388069.

It is an arithmetic number, because the mean of its divisors is an integer number (19014931).

Almost surely, 2^78985089 is an apocalyptic number.

It is an amenable number.

78985089 is a deficient number, since it is larger than the sum of its proper divisors (35104497).

78985089 is a wasteful number, since it uses less digits than its factorization.

78985089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8776127 (or 8776124 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The square root of 78985089 is about 8887.3555684467. The cubic root of 78985089 is about 429.0570449189.

The spelling of 78985089 in words is "seventy-eight million, nine hundred eighty-five thousand, eighty-nine".