78636469 has 2 divisors, whose sum is σ = 78636470. Its totient is φ = 78636468.

The previous prime is 78636463. The next prime is 78636473. The reversal of 78636469 is 96463687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62331025 + 16305444 = 7895^2 + 4038^2 .

It is a cyclic number.

It is not a de Polignac number, because 78636469 - 2³ = 78636461 is a prime.

It is a super-2 number, since 2×78636469² = 12367388513575922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78636461) 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, 39318234 + 39318235.

It is an arithmetic number, because the mean of its divisors is an integer number (39318235).

Almost surely, 2^78636469 is an apocalyptic number.

It is an amenable number.

78636469 is a deficient number, since it is larger than the sum of its proper divisors (1).

78636469 is an equidigital number, since it uses as much as digits as its factorization.

78636469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 49.

The square root of 78636469 is about 8867.7206203173. The cubic root of 78636469 is about 428.4248645235.

The spelling of 78636469 in words is "seventy-eight million, six hundred thirty-six thousand, four hundred sixty-nine".