664464852 has 18 divisors (see below), whose sum is σ = 1679619578. Its totient is φ = 221488272.

The previous prime is 664464851. The next prime is 664464863. The reversal of 664464852 is 258464466.

It can be written as a sum of positive squares in only one way, i.e., 549246096 + 115218756 = 23436^2 + 10734^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 664464798 and 664464807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664464851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9228643 + ... + 9228714.

Almost surely, 2^664464852 is an apocalyptic number.

It is an amenable number.

664464852 is an abundant number, since it is smaller than the sum of its proper divisors (1015154726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664464852 is a wasteful number, since it uses less digits than its factorization.

664464852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18457367 (or 18457362 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 664464852 is about 25777.2157534517. The cubic root of 664464852 is about 872.6176728726.

The spelling of 664464852 in words is "six hundred sixty-four million, four hundred sixty-four thousand, eight hundred fifty-two".