664368487 has 4 divisors (see below), whose sum is σ = 664533520. Its totient is φ = 664203456.

The previous prime is 664368473. The next prime is 664368491. The reversal of 664368487 is 784863466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 664368487 - 2¹⁵ = 664335719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664368427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76323 + ... + 84580.

It is an arithmetic number, because the mean of its divisors is an integer number (166133380).

Almost surely, 2^664368487 is an apocalyptic number.

664368487 is a deficient number, since it is larger than the sum of its proper divisors (165033).

664368487 is a wasteful number, since it uses less digits than its factorization.

664368487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165032.

The product of its digits is 4644864, while the sum is 52.

The square root of 664368487 is about 25775.3464962161. The cubic root of 664368487 is about 872.5754866093.

The spelling of 664368487 in words is "six hundred sixty-four million, three hundred sixty-eight thousand, four hundred eighty-seven".