64489809 has 16 divisors (see below), whose sum is σ = 88554752. Its totient is φ = 41722128.

The previous prime is 64489793. The next prime is 64489811. The reversal of 64489809 is 90898446.

It is not a de Polignac number, because 64489809 - 2⁴ = 64489793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64489849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19494 + ... + 22560.

It is an arithmetic number, because the mean of its divisors is an integer number (5534672).

Almost surely, 2^64489809 is an apocalyptic number.

It is an amenable number.

64489809 is a deficient number, since it is larger than the sum of its proper divisors (24064943).

64489809 is a wasteful number, since it uses less digits than its factorization.

64489809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276.

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 64489809 is about 8030.5547130942. The cubic root of 64489809 is about 401.0178432078.

The spelling of 64489809 in words is "sixty-four million, four hundred eighty-nine thousand, eight hundred nine".