78050209 has 2 divisors, whose sum is σ = 78050210. Its totient is φ = 78050208.

The previous prime is 78050197. The next prime is 78050227. The reversal of 78050209 is 90205087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50013184 + 28037025 = 7072^2 + 5295^2 .

It is a cyclic number.

It is not a de Polignac number, because 78050209 - 2¹³ = 78042017 is a prime.

It is equal to p_4562338 and since 78050209 and 4562338 have the same sum of digits, it is a Honaker prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39025104 + 39025105.

It is an arithmetic number, because the mean of its divisors is an integer number (39025105).

Almost surely, 2^78050209 is an apocalyptic number.

It is an amenable number.

78050209 is a deficient number, since it is larger than the sum of its proper divisors (1).

78050209 is an equidigital number, since it uses as much as digits as its factorization.

78050209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 78050209 is about 8834.6029339184. The cubic root of 78050209 is about 427.3575262492.

The spelling of 78050209 in words is "seventy-eight million, fifty thousand, two hundred nine".