653668 has 6 divisors (see below), whose sum is σ = 1143926. Its totient is φ = 326832.

The previous prime is 653659. The next prime is 653687. The reversal of 653668 is 866356.

It can be written as a sum of positive squares in only one way, i.e., 487204 + 166464 = 698^2 + 408^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 653668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81705 + ... + 81712.

2⁶⁵³⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

653668 is a deficient number, since it is larger than the sum of its proper divisors (490258).

653668 is a wasteful number, since it uses less digits than its factorization.

653668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163421 (or 163419 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 653668 is about 808.4973716717. The cubic root of 653668 is about 86.7865467905.

The spelling of 653668 in words is "six hundred fifty-three thousand, six hundred sixty-eight".