64687529 has 2 divisors, whose sum is σ = 64687530. Its totient is φ = 64687528.

The previous prime is 64687517. The next prime is 64687531. The reversal of 64687529 is 92578646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33327529 + 31360000 = 5773^2 + 5600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64687529 is a prime.

Together with 64687531, 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 (64687559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32343764 + 32343765.

It is an arithmetic number, because the mean of its divisors is an integer number (32343765).

Almost surely, 2^64687529 is an apocalyptic number.

It is an amenable number.

64687529 is a deficient number, since it is larger than the sum of its proper divisors (1).

64687529 is an equidigital number, since it uses as much as digits as its factorization.

64687529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 64687529 is about 8042.8557739151. The cubic root of 64687529 is about 401.4272533956.

The spelling of 64687529 in words is "sixty-four million, six hundred eighty-seven thousand, five hundred twenty-nine".