664287393 has 32 divisors (see below), whose sum is σ = 1169233920. Its totient is φ = 324783360.

The previous prime is 664287391. The next prime is 664287401. The reversal of 664287393 is 393782466.

It is not a de Polignac number, because 664287393 - 2¹ = 664287391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664287391) 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 31 ways as a sum of consecutive naturals, for example, 80653 + ... + 88506.

It is an arithmetic number, because the mean of its divisors is an integer number (36538560).

Almost surely, 2^664287393 is an apocalyptic number.

It is an amenable number.

664287393 is a deficient number, since it is larger than the sum of its proper divisors (504946527).

664287393 is a wasteful number, since it uses less digits than its factorization.

664287393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169197.

The product of its digits is 1306368, while the sum is 48.

The square root of 664287393 is about 25773.7733558748. The cubic root of 664287393 is about 872.5399824591.

The spelling of 664287393 in words is "six hundred sixty-four million, two hundred eighty-seven thousand, three hundred ninety-three".