78582869 has 2 divisors, whose sum is σ = 78582870. Its totient is φ = 78582868.

The previous prime is 78582863. The next prime is 78582877. The reversal of 78582869 is 96828587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77880625 + 702244 = 8825^2 + 838^2 .

It is a cyclic number.

It is not a de Polignac number, because 78582869 - 2⁴ = 78582853 is a prime.

It is a super-2 number, since 2×78582869² = 12350534600542322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78582869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78582863) 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, 39291434 + 39291435.

It is an arithmetic number, because the mean of its divisors is an integer number (39291435).

Almost surely, 2^78582869 is an apocalyptic number.

It is an amenable number.

78582869 is a deficient number, since it is larger than the sum of its proper divisors (1).

78582869 is an equidigital number, since it uses as much as digits as its factorization.

78582869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 53.

The square root of 78582869 is about 8864.6979079944. The cubic root of 78582869 is about 428.3275017585.

The spelling of 78582869 in words is "seventy-eight million, five hundred eighty-two thousand, eight hundred sixty-nine".