64478279 has 2 divisors, whose sum is σ = 64478280. Its totient is φ = 64478278.

The previous prime is 64478257. The next prime is 64478287. The reversal of 64478279 is 97287446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64478279 - 2⁸ = 64478023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64478779) 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, 32239139 + 32239140.

It is an arithmetic number, because the mean of its divisors is an integer number (32239140).

Almost surely, 2^64478279 is an apocalyptic number.

64478279 is a deficient number, since it is larger than the sum of its proper divisors (1).

64478279 is an equidigital number, since it uses as much as digits as its factorization.

64478279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 64478279 is about 8029.8367978434. The cubic root of 64478279 is about 400.9939427322.

The spelling of 64478279 in words is "sixty-four million, four hundred seventy-eight thousand, two hundred seventy-nine".