609864 has 16 divisors (see below), whose sum is σ = 1524720. Its totient is φ = 203280.

The previous prime is 609859. The next prime is 609877. The reversal of 609864 is 468906.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 609864.

It is an unprimeable number.

609864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12682 + ... + 12729.

It is an arithmetic number, because the mean of its divisors is an integer number (95295).

2⁶⁰⁹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

609864 is an abundant number, since it is smaller than the sum of its proper divisors (914856).

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

609864 is a wasteful number, since it uses less digits than its factorization.

609864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25420 (or 25416 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 609864 is about 780.9378976590. The cubic root of 609864 is about 84.8029576517.

The spelling of 609864 in words is "six hundred nine thousand, eight hundred sixty-four".