64850809 has 3 divisors (see below), whose sum is σ = 64858863. Its totient is φ = 64842756.

The previous prime is 64850771. The next prime is 64850827. The reversal of 64850809 is 90805846.

The square root of 64850809 is 8053.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90805846 = 2 ⋅45402923.

It can be written as a sum of positive squares in only one way, i.e., 50197225 + 14653584 = 7085^2 + 3828^2 .

It is not a de Polignac number, because 64850809 - 2⁹ = 64850297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64850839) 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 in 2 ways as a sum of consecutive naturals, for example, 4027 + ... + 12079.

It is an arithmetic number, because the mean of its divisors is an integer number (21619621).

Almost surely, 2^64850809 is an apocalyptic number.

64850809 is the 8053-rd square number.

64850809 is the 4027-th centered octagonal number.

It is an amenable number.

64850809 is a deficient number, since it is larger than the sum of its proper divisors (8054).

64850809 is an frugal number, since it uses more digits than its factorization.

64850809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16106 (or 8053 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The cubic root of 64850809 is about 401.7647216938.

The spelling of 64850809 in words is "sixty-four million, eight hundred fifty thousand, eight hundred nine".