663879 has 12 divisors (see below), whose sum is σ = 935736. Its totient is φ = 418608.

The previous prime is 663869. The next prime is 663881. The reversal of 663879 is 978366.

It is not a de Polignac number, because 663879 - 2¹² = 659783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 777 + ... + 1389.

It is an arithmetic number, because the mean of its divisors is an integer number (77978).

2⁶⁶³⁸⁷⁹ is an apocalyptic number.

663879 is a deficient number, since it is larger than the sum of its proper divisors (271857).

663879 is a wasteful number, since it uses less digits than its factorization.

663879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 635 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 663879 is about 814.7877024109. The cubic root of 663879 is about 87.2361138044.

The spelling of 663879 in words is "six hundred sixty-three thousand, eight hundred seventy-nine".