64871687 has 2 divisors, whose sum is σ = 64871688. Its totient is φ = 64871686.

The previous prime is 64871671. The next prime is 64871689. The reversal of 64871687 is 78617846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64871687 - 2⁴ = 64871671 is a prime.

Together with 64871689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64871689) 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, 32435843 + 32435844.

It is an arithmetic number, because the mean of its divisors is an integer number (32435844).

Almost surely, 2^64871687 is an apocalyptic number.

64871687 is a deficient number, since it is larger than the sum of its proper divisors (1).

64871687 is an equidigital number, since it uses as much as digits as its factorization.

64871687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 64871687 is about 8054.2961827834. The cubic root of 64871687 is about 401.8078316360.

The spelling of 64871687 in words is "sixty-four million, eight hundred seventy-one thousand, six hundred eighty-seven".