664271867 has 8 divisors (see below), whose sum is σ = 764004576. Its totient is φ = 565748352.

The previous prime is 664271857. The next prime is 664271879. The reversal of 664271867 is 768172466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664271867 - 2²⁸ = 395836411 is a prime.

It is a super-2 number, since 2×664271867² = 882514226575331378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664271807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301118 + ... + 303315.

It is an arithmetic number, because the mean of its divisors is an integer number (95500572).

Almost surely, 2^664271867 is an apocalyptic number.

664271867 is a deficient number, since it is larger than the sum of its proper divisors (99732709).

664271867 is a wasteful number, since it uses less digits than its factorization.

664271867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604597.

The product of its digits is 677376, while the sum is 47.

The square root of 664271867 is about 25773.4721564635. The cubic root of 664271867 is about 872.5331846175.

The spelling of 664271867 in words is "six hundred sixty-four million, two hundred seventy-one thousand, eight hundred sixty-seven".