659904 has 56 divisors (see below), whose sum is σ = 1999488. Its totient is φ = 188160.

The previous prime is 659899. The next prime is 659917. The reversal of 659904 is 409956.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099 + ... + 1589.

2⁶⁵⁹⁹⁰⁴ is an apocalyptic number.

659904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 659904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999744).

659904 is an abundant number, since it is smaller than the sum of its proper divisors (1339584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

659904 is a wasteful number, since it uses less digits than its factorization.

659904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 659904 is about 812.3447543993. The cubic root of 659904 is about 87.0616553312.

The spelling of 659904 in words is "six hundred fifty-nine thousand, nine hundred four".