668613284 has 12 divisors (see below), whose sum is σ = 1171973964. Its totient is φ = 333763584.

The previous prime is 668613277. The next prime is 668613329. The reversal of 668613284 is 482316866.

It can be written as a sum of positive squares in 2 ways, for example, as 278155684 + 390457600 = 16678^2 + 19760^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132989 + ... + 137924.

It is an arithmetic number, because the mean of its divisors is an integer number (97664497).

Almost surely, 2^668613284 is an apocalyptic number.

It is an amenable number.

668613284 is a deficient number, since it is larger than the sum of its proper divisors (503360680).

668613284 is a wasteful number, since it uses less digits than its factorization.

668613284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271534 (or 271532 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The square root of 668613284 is about 25857.5575799417. The cubic root of 668613284 is about 874.4299019447.

The spelling of 668613284 in words is "six hundred sixty-eight million, six hundred thirteen thousand, two hundred eighty-four".