64705139 has 2 divisors, whose sum is σ = 64705140. Its totient is φ = 64705138.

The previous prime is 64705133. The next prime is 64705159. The reversal of 64705139 is 93150746.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64705139 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64705099 and 64705108.

It is not a weakly prime, because it can be changed into another prime (64705133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32352569 + 32352570.

It is an arithmetic number, because the mean of its divisors is an integer number (32352570).

Almost surely, 2^64705139 is an apocalyptic number.

64705139 is a deficient number, since it is larger than the sum of its proper divisors (1).

64705139 is an equidigital number, since it uses as much as digits as its factorization.

64705139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 64705139 is about 8043.9504598176. The cubic root of 64705139 is about 401.4636771734.

The spelling of 64705139 in words is "sixty-four million, seven hundred five thousand, one hundred thirty-nine".