664215248 has 10 divisors (see below), whose sum is σ = 1286917074. Its totient is φ = 332107616.

The previous prime is 664215241. The next prime is 664215283. The reversal of 664215248 is 842512466.

It can be written as a sum of positive squares in only one way, i.e., 658025104 + 6190144 = 25652^2 + 2488^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664215241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20756711 + ... + 20756742.

Almost surely, 2^664215248 is an apocalyptic number.

It is an amenable number.

664215248 is a deficient number, since it is larger than the sum of its proper divisors (622701826).

664215248 is a wasteful number, since it uses less digits than its factorization.

664215248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41513461 (or 41513455 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The square root of 664215248 is about 25772.3737362316. The cubic root of 664215248 is about 872.5083938843.

The spelling of 664215248 in words is "six hundred sixty-four million, two hundred fifteen thousand, two hundred forty-eight".