64840123 has 2 divisors, whose sum is σ = 64840124. Its totient is φ = 64840122.

The previous prime is 64840109. The next prime is 64840129. The reversal of 64840123 is 32104846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64840123 - 2⁹ = 64839611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64840091 and 64840100.

It is not a weakly prime, because it can be changed into another prime (64840129) 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, 32420061 + 32420062.

It is an arithmetic number, because the mean of its divisors is an integer number (32420062).

Almost surely, 2^64840123 is an apocalyptic number.

64840123 is a deficient number, since it is larger than the sum of its proper divisors (1).

64840123 is an equidigital number, since it uses as much as digits as its factorization.

64840123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 64840123 is about 8052.3364932174. The cubic root of 64840123 is about 401.7426531249.

Adding to 64840123 its reverse (32104846), we get a palindrome (96944969).

The spelling of 64840123 in words is "sixty-four million, eight hundred forty thousand, one hundred twenty-three".