78236089 has 2 divisors, whose sum is σ = 78236090. Its totient is φ = 78236088.

The previous prime is 78236051. The next prime is 78236131. The reversal of 78236089 is 98063287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75986089 + 2250000 = 8717^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 78236089 - 2¹¹ = 78234041 is a prime.

It is a super-2 number, since 2×78236089² = 12241771244031842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78236009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39118044 + 39118045.

It is an arithmetic number, because the mean of its divisors is an integer number (39118045).

Almost surely, 2^78236089 is an apocalyptic number.

It is an amenable number.

78236089 is a deficient number, since it is larger than the sum of its proper divisors (1).

78236089 is an equidigital number, since it uses as much as digits as its factorization.

78236089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 78236089 is about 8845.1166753186. The cubic root of 78236089 is about 427.6965141913.

The spelling of 78236089 in words is "seventy-eight million, two hundred thirty-six thousand, eighty-nine".