64272809 has 2 divisors, whose sum is σ = 64272810. Its totient is φ = 64272808.

The previous prime is 64272797. The next prime is 64272851. The reversal of 64272809 is 90827246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42445225 + 21827584 = 6515^2 + 4672^2 .

It is a cyclic number.

It is not a de Polignac number, because 64272809 - 2¹² = 64268713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64272209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32136404 + 32136405.

It is an arithmetic number, because the mean of its divisors is an integer number (32136405).

Almost surely, 2^64272809 is an apocalyptic number.

It is an amenable number.

64272809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64272809 is an equidigital number, since it uses as much as digits as its factorization.

64272809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 64272809 is about 8017.0324310184. The cubic root of 64272809 is about 400.5675464301.

The spelling of 64272809 in words is "sixty-four million, two hundred seventy-two thousand, eight hundred nine".