64032809 has 2 divisors, whose sum is σ = 64032810. Its totient is φ = 64032808.

The previous prime is 64032797. The next prime is 64032811. The reversal of 64032809 is 90823046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56957209 + 7075600 = 7547^2 + 2660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64032809 is a prime.

Together with 64032811, 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 (64032209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32016404 + 32016405.

It is an arithmetic number, because the mean of its divisors is an integer number (32016405).

Almost surely, 2^64032809 is an apocalyptic number.

It is an amenable number.

64032809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64032809 is an equidigital number, since it uses as much as digits as its factorization.

64032809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 64032809 is about 8002.0502997669. The cubic root of 64032809 is about 400.0683404066.

The spelling of 64032809 in words is "sixty-four million, thirty-two thousand, eight hundred nine".