659778 has 32 divisors (see below), whose sum is σ = 1575936. Its totient is φ = 180048.

The previous prime is 659761. The next prime is 659783. The reversal of 659778 is 877956.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 625 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (49248).

2⁶⁵⁹⁷⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 659778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787968).

659778 is an abundant number, since it is smaller than the sum of its proper divisors (916158).

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

659778 is a wasteful number, since it uses less digits than its factorization.

659778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718.

The product of its digits is 105840, while the sum is 42.

The square root of 659778 is about 812.2671974172. The cubic root of 659778 is about 87.0561138854.

The spelling of 659778 in words is "six hundred fifty-nine thousand, seven hundred seventy-eight".