659978 has 16 divisors (see below), whose sum is σ = 1092960. Its totient is φ = 296400.

The previous prime is 659963. The next prime is 659983. The reversal of 659978 is 879956.

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, 2768 + ... + 2996.

It is an arithmetic number, because the mean of its divisors is an integer number (68310).

2⁶⁵⁹⁹⁷⁸ is an apocalyptic number.

659978 is a deficient number, since it is larger than the sum of its proper divisors (432982).

659978 is a wasteful number, since it uses less digits than its factorization.

659978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its digits is 136080, while the sum is 44.

The square root of 659978 is about 812.3903002868. The cubic root of 659978 is about 87.0649095024.

The spelling of 659978 in words is "six hundred fifty-nine thousand, nine hundred seventy-eight".