664488238 has 4 divisors (see below), whose sum is σ = 996732360. Its totient is φ = 332244118.

The previous prime is 664488233. The next prime is 664488269. The reversal of 664488238 is 832884466.

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

It is a junction number, because it is equal to n+sod(n) for n = 664488191 and 664488200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664488233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166122058 + ... + 166122061.

It is an arithmetic number, because the mean of its divisors is an integer number (249183090).

Almost surely, 2^664488238 is an apocalyptic number.

664488238 is a deficient number, since it is larger than the sum of its proper divisors (332244122).

664488238 is a wasteful number, since it uses less digits than its factorization.

664488238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332244121.

The product of its digits is 1769472, while the sum is 49.

The square root of 664488238 is about 25777.6693671092. The cubic root of 664488238 is about 872.6279100820.

The spelling of 664488238 in words is "six hundred sixty-four million, four hundred eighty-eight thousand, two hundred thirty-eight".