664387822 has 8 divisors (see below), whose sum is σ = 1138950576. Its totient is φ = 284737632.

The previous prime is 664387813. The next prime is 664387943. The reversal of 664387822 is 228783466.

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

It is a super-2 number, since 2×664387822² = 882822356043807368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23728123 + ... + 23728150.

It is an arithmetic number, because the mean of its divisors is an integer number (142368822).

Almost surely, 2^664387822 is an apocalyptic number.

664387822 is a deficient number, since it is larger than the sum of its proper divisors (474562754).

664387822 is a wasteful number, since it uses less digits than its factorization.

664387822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47456282.

The product of its digits is 774144, while the sum is 46.

The square root of 664387822 is about 25775.7215611901. The cubic root of 664387822 is about 872.5839513312.

The spelling of 664387822 in words is "six hundred sixty-four million, three hundred eighty-seven thousand, eight hundred twenty-two".