617668 has 6 divisors (see below), whose sum is σ = 1080926. Its totient is φ = 308832.

The previous prime is 617657. The next prime is 617677. The reversal of 617668 is 866716.

It can be written as a sum of positive squares in only one way, i.e., 369664 + 248004 = 608^2 + 498^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77205 + ... + 77212.

2⁶¹⁷⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

617668 is a deficient number, since it is larger than the sum of its proper divisors (463258).

617668 is a wasteful number, since it uses less digits than its factorization.

617668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154421 (or 154419 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 617668 is about 785.9185708456. The cubic root of 617668 is about 85.1631468673.

The spelling of 617668 in words is "six hundred seventeen thousand, six hundred sixty-eight".