64886809 has 4 divisors (see below), whose sum is σ = 69878116. Its totient is φ = 59895504.

The previous prime is 64886803. The next prime is 64886831. The reversal of 64886809 is 90868846.

64886809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4000000 + 60886809 = 2000^2 + 7803^2 .

It is a cyclic number.

It is not a de Polignac number, because 64886809 - 2¹¹ = 64884761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64886803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495634 + ... + 2495659.

It is an arithmetic number, because the mean of its divisors is an integer number (17469529).

Almost surely, 2^64886809 is an apocalyptic number.

It is an amenable number.

64886809 is a deficient number, since it is larger than the sum of its proper divisors (4991307).

64886809 is a wasteful number, since it uses less digits than its factorization.

64886809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4991306.

The product of its (nonzero) digits is 663552, while the sum is 49.

The square root of 64886809 is about 8055.2348817399. The cubic root of 64886809 is about 401.8390505249.

The spelling of 64886809 in words is "sixty-four million, eight hundred eighty-six thousand, eight hundred nine".