64278443 has 4 divisors (see below), whose sum is σ = 64383240. Its totient is φ = 64173648.

The previous prime is 64278433. The next prime is 64278449. The reversal of 64278443 is 34487246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34487246 = 2 ⋅17243623.

It is a cyclic number.

It is not a de Polignac number, because 64278443 - 2⁴ = 64278427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64278397 and 64278406.

It is not an unprimeable number, because it can be changed into a prime (64278449) 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 in 3 ways as a sum of consecutive naturals, for example, 51473 + ... + 52706.

It is an arithmetic number, because the mean of its divisors is an integer number (16095810).

Almost surely, 2^64278443 is an apocalyptic number.

64278443 is a deficient number, since it is larger than the sum of its proper divisors (104797).

64278443 is a wasteful number, since it uses less digits than its factorization.

64278443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104796.

The product of its digits is 129024, while the sum is 38.

The square root of 64278443 is about 8017.3838002181. The cubic root of 64278443 is about 400.5792503510.

The spelling of 64278443 in words is "sixty-four million, two hundred seventy-eight thousand, four hundred forty-three".