64278493 has 2 divisors, whose sum is σ = 64278494. Its totient is φ = 64278492.

The previous prime is 64278481. The next prime is 64278497. The reversal of 64278493 is 39487246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54804409 + 9474084 = 7403^2 + 3078^2 .

It is a cyclic number.

It is not a de Polignac number, because 64278493 - 2⁹ = 64277981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64278497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32139246 + 32139247.

It is an arithmetic number, because the mean of its divisors is an integer number (32139247).

Almost surely, 2^64278493 is an apocalyptic number.

It is an amenable number.

64278493 is a deficient number, since it is larger than the sum of its proper divisors (1).

64278493 is an equidigital number, since it uses as much as digits as its factorization.

64278493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 64278493 is about 8017.3869184417. The cubic root of 64278493 is about 400.5793542166.

The spelling of 64278493 in words is "sixty-four million, two hundred seventy-eight thousand, four hundred ninety-three".