678764 has 6 divisors (see below), whose sum is σ = 1187844. Its totient is φ = 339380.

The previous prime is 678763. The next prime is 678767. The reversal of 678764 is 467876.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678764.

It is not an unprimeable number, because it can be changed into a prime (678761) 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 as a sum of consecutive naturals, namely, 84842 + ... + 84849.

It is an arithmetic number, because the mean of its divisors is an integer number (197974).

2⁶⁷⁸⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

678764 is a deficient number, since it is larger than the sum of its proper divisors (509080).

678764 is a wasteful number, since it uses less digits than its factorization.

678764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169695 (or 169693 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 678764 is about 823.8713491802. The cubic root of 678764 is about 87.8832818994.

The spelling of 678764 in words is "six hundred seventy-eight thousand, seven hundred sixty-four".