664287585 has 32 divisors (see below), whose sum is σ = 1146821760. Its totient is φ = 326404608.

The previous prime is 664287583. The next prime is 664287593. The reversal of 664287585 is 585782466.

It is a happy number.

It is not a de Polignac number, because 664287585 - 2¹ = 664287583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664287583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107962 + ... + 113948.

It is an arithmetic number, because the mean of its divisors is an integer number (35838180).

Almost surely, 2^664287585 is an apocalyptic number.

664287585 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

664287585 is a deficient number, since it is larger than the sum of its proper divisors (482534175).

664287585 is a wasteful number, since it uses less digits than its factorization.

664287585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6577.

The product of its digits is 3225600, while the sum is 51.

The square root of 664287585 is about 25773.7770805910. Note that the first 3 decimals coincide. The cubic root of 664287585 is about 872.5400665229.

The spelling of 664287585 in words is "six hundred sixty-four million, two hundred eighty-seven thousand, five hundred eighty-five".