78968209 has 4 divisors (see below), whose sum is σ = 79072740. Its totient is φ = 78863680.

The previous prime is 78968207. The next prime is 78968231. The reversal of 78968209 is 90286987.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32455809 + 46512400 = 5697^2 + 6820^2 .

It is a cyclic number.

It is not a de Polignac number, because 78968209 - 2¹ = 78968207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78968207) 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, 51124 + ... + 52645.

It is an arithmetic number, because the mean of its divisors is an integer number (19768185).

Almost surely, 2^78968209 is an apocalyptic number.

It is an amenable number.

78968209 is a deficient number, since it is larger than the sum of its proper divisors (104531).

78968209 is a wasteful number, since it uses less digits than its factorization.

78968209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104530.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 78968209 is about 8886.4058538872. The cubic root of 78968209 is about 429.0264779726.

The spelling of 78968209 in words is "seventy-eight million, nine hundred sixty-eight thousand, two hundred nine".