78569 has 2 divisors, whose sum is σ = 78570. Its totient is φ = 78568.

The previous prime is 78553. The next prime is 78571. The reversal of 78569 is 96587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 169 = 280^2 + 13^2 .

It is an emirp because it is prime and its reverse (96587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78569 - 2⁴ = 78553 is a prime.

It is a super-2 number, since 2×78569² = 12346175522, which contains 22 as substring.

Together with 78571, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (78509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39284 + 39285.

It is an arithmetic number, because the mean of its divisors is an integer number (39285).

2⁷⁸⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

78569 is a deficient number, since it is larger than the sum of its proper divisors (1).

78569 is an equidigital number, since it uses as much as digits as its factorization.

78569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 78569 is about 280.3016232561. The cubic root of 78569 is about 42.8302301934.

The spelling of 78569 in words is "seventy-eight thousand, five hundred sixty-nine".