64000809 has 12 divisors (see below), whose sum is σ = 93014896. Its totient is φ = 42404472.

The previous prime is 64000757. The next prime is 64000817. The reversal of 64000809 is 90800046.

It is not a de Polignac number, because 64000809 - 2¹⁶ = 63935273 is a prime.

It is a super-2 number, since 2×64000809² = 8192207105308962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64000819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20347 + ... + 23280.

Almost surely, 2^64000809 is an apocalyptic number.

It is an amenable number.

64000809 is a deficient number, since it is larger than the sum of its proper divisors (29014087).

64000809 is a wasteful number, since it uses less digits than its factorization.

64000809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43796 (or 43793 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 64000809 is about 8000.0505623402. The cubic root of 64000809 is about 400.0016854096.

The spelling of 64000809 in words is "sixty-four million, eight hundred nine", and thus it is an aban number.