64705439 has 2 divisors, whose sum is σ = 64705440. Its totient is φ = 64705438.

The previous prime is 64705427. The next prime is 64705493. The reversal of 64705439 is 93450746.

Together with next prime (64705493) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64705439 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64705139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32352719 + 32352720.

It is an arithmetic number, because the mean of its divisors is an integer number (32352720).

Almost surely, 2^64705439 is an apocalyptic number.

64705439 is a deficient number, since it is larger than the sum of its proper divisors (1).

64705439 is an equidigital number, since it uses as much as digits as its factorization.

64705439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 64705439 is about 8043.9691073499. The cubic root of 64705439 is about 401.4642976235.

The spelling of 64705439 in words is "sixty-four million, seven hundred five thousand, four hundred thirty-nine".