678164 has 12 divisors (see below), whose sum is σ = 1256724. Its totient is φ = 319104.

The previous prime is 678157. The next prime is 678169. The reversal of 678164 is 461876.

It can be written as a sum of positive squares in 2 ways, for example, as 293764 + 384400 = 542^2 + 620^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678164.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4919 + ... + 5054.

It is an arithmetic number, because the mean of its divisors is an integer number (104727).

2⁶⁷⁸¹⁶⁴ is an apocalyptic number.

It is an amenable number.

678164 is a deficient number, since it is larger than the sum of its proper divisors (578560).

678164 is a wasteful number, since it uses less digits than its factorization.

678164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9994 (or 9992 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 678164 is about 823.5071341525. The cubic root of 678164 is about 87.8573791734.

The spelling of 678164 in words is "six hundred seventy-eight thousand, one hundred sixty-four".