64678469 has 2 divisors, whose sum is σ = 64678470. Its totient is φ = 64678468.

The previous prime is 64678459. The next prime is 64678477. The reversal of 64678469 is 96487646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 438244 = 8015^2 + 662^2 .

It is a cyclic number.

It is not a de Polignac number, because 64678469 - 2⁸ = 64678213 is a prime.

It is a super-2 number, since 2×64678469² = 8366608704367922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64678409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32339234 + 32339235.

It is an arithmetic number, because the mean of its divisors is an integer number (32339235).

Almost surely, 2^64678469 is an apocalyptic number.

It is an amenable number.

64678469 is a deficient number, since it is larger than the sum of its proper divisors (1).

64678469 is an equidigital number, since it uses as much as digits as its factorization.

64678469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 50.

The square root of 64678469 is about 8042.2925214145. The cubic root of 64678469 is about 401.4085115002.

The spelling of 64678469 in words is "sixty-four million, six hundred seventy-eight thousand, four hundred sixty-nine".