664867048 has 8 divisors (see below), whose sum is σ = 1246625730. Its totient is φ = 332433520.

The previous prime is 664867037. The next prime is 664867061. The reversal of 664867048 is 840768466.

It can be written as a sum of positive squares in only one way, i.e., 357285604 + 307581444 = 18902^2 + 17538^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 664866992 and 664867010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41554183 + ... + 41554198.

Almost surely, 2^664867048 is an apocalyptic number.

It is an amenable number.

664867048 is a deficient number, since it is larger than the sum of its proper divisors (581758682).

664867048 is a wasteful number, since it uses less digits than its factorization.

664867048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83108387 (or 83108383 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 49.

The square root of 664867048 is about 25785.0159588859. The cubic root of 664867048 is about 872.7937005177.

The spelling of 664867048 in words is "six hundred sixty-four million, eight hundred sixty-seven thousand, forty-eight".