659820 has 48 divisors (see below), whose sum is σ = 2112768. Its totient is φ = 150720.

The previous prime is 659819. The next prime is 659831. The reversal of 659820 is 28956.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (44016).

2⁶⁵⁹⁸²⁰ is an apocalyptic number.

659820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

659820 is an abundant number, since it is smaller than the sum of its proper divisors (1452948).

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

659820 is a wasteful number, since it uses less digits than its factorization.

659820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 659820 is about 812.2930505673. The cubic root of 659820 is about 87.0579611124.

The spelling of 659820 in words is "six hundred fifty-nine thousand, eight hundred twenty".