664967827 has 4 divisors (see below), whose sum is σ = 666239800. Its totient is φ = 663695856.

The previous prime is 664967783. The next prime is 664967851. The reversal of 664967827 is 728769466.

664967827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664967827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664967857) 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, 635202 + ... + 636247.

It is an arithmetic number, because the mean of its divisors is an integer number (166559950).

Almost surely, 2^664967827 is an apocalyptic number.

664967827 is a deficient number, since it is larger than the sum of its proper divisors (1271973).

664967827 is a wasteful number, since it uses less digits than its factorization.

664967827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271972.

The product of its digits is 6096384, while the sum is 55.

The square root of 664967827 is about 25786.9701011965. The cubic root of 664967827 is about 872.8377969691.

The spelling of 664967827 in words is "six hundred sixty-four million, nine hundred sixty-seven thousand, eight hundred twenty-seven".