64685839 has 2 divisors, whose sum is σ = 64685840. Its totient is φ = 64685838.

The previous prime is 64685837. The next prime is 64685849. The reversal of 64685839 is 93858646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64685839 - 2¹ = 64685837 is a prime.

Together with 64685837, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 64685792 and 64685801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64685837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32342919 + 32342920.

It is an arithmetic number, because the mean of its divisors is an integer number (32342920).

Almost surely, 2^64685839 is an apocalyptic number.

64685839 is a deficient number, since it is larger than the sum of its proper divisors (1).

64685839 is an equidigital number, since it uses as much as digits as its factorization.

64685839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 49.

The square root of 64685839 is about 8042.7507110441. The cubic root of 64685839 is about 401.4237575236.

The spelling of 64685839 in words is "sixty-four million, six hundred eighty-five thousand, eight hundred thirty-nine".