64871689 has 2 divisors, whose sum is σ = 64871690. Its totient is φ = 64871688.

The previous prime is 64871687. The next prime is 64871749. The reversal of 64871689 is 98617846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43665664 + 21206025 = 6608^2 + 4605^2 .

It is a cyclic number.

It is not a de Polignac number, because 64871689 - 2¹ = 64871687 is a prime.

Together with 64871687, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64871687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32435844 + 32435845.

It is an arithmetic number, because the mean of its divisors is an integer number (32435845).

Almost surely, 2^64871689 is an apocalyptic number.

It is an amenable number.

64871689 is a deficient number, since it is larger than the sum of its proper divisors (1).

64871689 is an equidigital number, since it uses as much as digits as its factorization.

64871689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 64871689 is about 8054.2963069408. The cubic root of 64871689 is about 401.8078357652.

The spelling of 64871689 in words is "sixty-four million, eight hundred seventy-one thousand, six hundred eighty-nine".