78910985 has 8 divisors (see below), whose sum is σ = 94779720. Its totient is φ = 63071104.

The previous prime is 78910981. The next prime is 78910987. The reversal of 78910985 is 58901987.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33051001 + 45859984 = 5749^2 + 6772^2 .

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 78910985 - 2² = 78910981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78910981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650 + ... + 12579.

It is an arithmetic number, because the mean of its divisors is an integer number (11847465).

Almost surely, 2^78910985 is an apocalyptic number.

It is an amenable number.

78910985 is a deficient number, since it is larger than the sum of its proper divisors (15868735).

78910985 is a wasteful number, since it uses less digits than its factorization.

78910985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14427.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 78910985 is about 8883.1855209716. The cubic root of 78910985 is about 428.9228221511.

The spelling of 78910985 in words is "seventy-eight million, nine hundred ten thousand, nine hundred eighty-five".