654978 has 16 divisors (see below), whose sum is σ = 1319616. Its totient is φ = 216720.

The previous prime is 654967. The next prime is 654991. The reversal of 654978 is 879456.

It is an unprimeable number.

654978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 723 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (82476).

2⁶⁵⁴⁹⁷⁸ is an apocalyptic number.

654978 is an abundant number, since it is smaller than the sum of its proper divisors (664638).

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

654978 is a wasteful number, since it uses less digits than its factorization.

654978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809.

The product of its digits is 60480, while the sum is 39.

The square root of 654978 is about 809.3071110524. The cubic root of 654978 is about 86.8444837007.

The spelling of 654978 in words is "six hundred fifty-four thousand, nine hundred seventy-eight".