64378543 has 2 divisors, whose sum is σ = 64378544. Its totient is φ = 64378542.

The previous prime is 64378529. The next prime is 64378621. The reversal of 64378543 is 34587346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64378543 - 2¹³ = 64370351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64378496 and 64378505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64378943) 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, 32189271 + 32189272.

It is an arithmetic number, because the mean of its divisors is an integer number (32189272).

Almost surely, 2^64378543 is an apocalyptic number.

64378543 is a deficient number, since it is larger than the sum of its proper divisors (1).

64378543 is an equidigital number, since it uses as much as digits as its factorization.

64378543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 40.

The square root of 64378543 is about 8023.6240564972. The cubic root of 64378543 is about 400.7870814910.

The spelling of 64378543 in words is "sixty-four million, three hundred seventy-eight thousand, five hundred forty-three".