64228309 has 2 divisors, whose sum is σ = 64228310. Its totient is φ = 64228308.

The previous prime is 64228169. The next prime is 64228313. The reversal of 64228309 is 90382246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55800900 + 8427409 = 7470^2 + 2903^2 .

It is a cyclic number.

It is not a de Polignac number, because 64228309 - 2¹⁵ = 64195541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64228319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32114154 + 32114155.

It is an arithmetic number, because the mean of its divisors is an integer number (32114155).

Almost surely, 2^64228309 is an apocalyptic number.

It is an amenable number.

64228309 is a deficient number, since it is larger than the sum of its proper divisors (1).

64228309 is an equidigital number, since it uses as much as digits as its factorization.

64228309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 64228309 is about 8014.2566093182. The cubic root of 64228309 is about 400.4750792758.

The spelling of 64228309 in words is "sixty-four million, two hundred twenty-eight thousand, three hundred nine".