78575569 has 2 divisors, whose sum is σ = 78575570. Its totient is φ = 78575568.

The previous prime is 78575561. The next prime is 78575573. The reversal of 78575569 is 96557587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65529025 + 13046544 = 8095^2 + 3612^2 .

It is a cyclic number.

It is not a de Polignac number, because 78575569 - 2³ = 78575561 is a prime.

It is a super-2 number, since 2×78575569² = 12348240087347522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78575561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39287784 + 39287785.

It is an arithmetic number, because the mean of its divisors is an integer number (39287785).

Almost surely, 2^78575569 is an apocalyptic number.

It is an amenable number.

78575569 is a deficient number, since it is larger than the sum of its proper divisors (1).

78575569 is an equidigital number, since it uses as much as digits as its factorization.

78575569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646000, while the sum is 52.

The square root of 78575569 is about 8864.2861528721. The cubic root of 78575569 is about 428.3142381060.

The spelling of 78575569 in words is "seventy-eight million, five hundred seventy-five thousand, five hundred sixty-nine".