78422489 has 2 divisors, whose sum is σ = 78422490. Its totient is φ = 78422488.

The previous prime is 78422453. The next prime is 78422501. The reversal of 78422489 is 98422487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74046025 + 4376464 = 8605^2 + 2092^2 .

It is an emirp because it is prime and its reverse (98422487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78422489 - 2¹⁶ = 78356953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78422419) 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 as a sum of consecutive naturals, namely, 39211244 + 39211245.

It is an arithmetic number, because the mean of its divisors is an integer number (39211245).

Almost surely, 2^78422489 is an apocalyptic number.

It is an amenable number.

78422489 is a deficient number, since it is larger than the sum of its proper divisors (1).

78422489 is an equidigital number, since it uses as much as digits as its factorization.

78422489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 44.

The square root of 78422489 is about 8855.6472942411. The cubic root of 78422489 is about 428.0359116954.

The spelling of 78422489 in words is "seventy-eight million, four hundred twenty-two thousand, four hundred eighty-nine".