677978 has 16 divisors (see below), whose sum is σ = 1178880. Its totient is φ = 286416.

The previous prime is 677959. The next prime is 677983. The reversal of 677978 is 879776.

677978 is nontrivially palindromic in base 16.

It is a Curzon number.

It is an unprimeable number.

677978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800 + ... + 1412.

It is an arithmetic number, because the mean of its divisors is an integer number (73680).

2⁶⁷⁷⁹⁷⁸ is an apocalyptic number.

677978 is a deficient number, since it is larger than the sum of its proper divisors (500902).

677978 is a wasteful number, since it uses less digits than its factorization.

677978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701.

The product of its digits is 148176, while the sum is 44.

The square root of 677978 is about 823.3941947816. The cubic root of 677978 is about 87.8493462262.

The spelling of 677978 in words is "six hundred seventy-seven thousand, nine hundred seventy-eight".