64952809 has 2 divisors, whose sum is σ = 64952810. Its totient is φ = 64952808.

The previous prime is 64952749. The next prime is 64952819. The reversal of 64952809 is 90825946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 29192409 = 5980^2 + 5403^2 .

It is a cyclic number.

It is not a de Polignac number, because 64952809 - 2¹⁵ = 64920041 is a prime.

It is a super-3 number, since 3×64952809³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (64952819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32476404 + 32476405.

It is an arithmetic number, because the mean of its divisors is an integer number (32476405).

Almost surely, 2^64952809 is an apocalyptic number.

It is an amenable number.

64952809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64952809 is an equidigital number, since it uses as much as digits as its factorization.

64952809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 64952809 is about 8059.3305553253. The cubic root of 64952809 is about 401.9752486762.

The spelling of 64952809 in words is "sixty-four million, nine hundred fifty-two thousand, eight hundred nine".