664460242 has 12 divisors (see below), whose sum is σ = 1013880366. Its totient is φ = 326595680.

The previous prime is 664460233. The next prime is 664460243. The reversal of 664460242 is 242064466.

It can be written as a sum of positive squares in only one way, i.e., 448634761 + 215825481 = 21181^2 + 14691^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664460198 and 664460207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664460243) 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, 40759 + ... + 54682.

Almost surely, 2^664460242 is an apocalyptic number.

664460242 is a deficient number, since it is larger than the sum of its proper divisors (349420124).

664460242 is an equidigital number, since it uses as much as digits as its factorization.

664460242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95561 (or 95502 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 664460242 is about 25777.1263332436. The cubic root of 664460242 is about 872.6156548191.

The spelling of 664460242 in words is "six hundred sixty-four million, four hundred sixty thousand, two hundred forty-two".