609978 has 8 divisors (see below), whose sum is σ = 1219968. Its totient is φ = 203324.

The previous prime is 609929. The next prime is 609979. The reversal of 609978 is 879906.

It is a sphenic number, since it is the product of 3 distinct primes.

609978 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (609979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50826 + ... + 50837.

It is an arithmetic number, because the mean of its divisors is an integer number (152496).

2⁶⁰⁹⁹⁷⁸ is an apocalyptic number.

609978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

609978 is a wasteful number, since it uses less digits than its factorization.

609978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101668.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 609978 is about 781.0108834069. The cubic root of 609978 is about 84.8082413077.

The spelling of 609978 in words is "six hundred nine thousand, nine hundred seventy-eight".