678623 has 16 divisors (see below), whose sum is σ = 829440. Its totient is φ = 547200.

The previous prime is 678611. The next prime is 678631. The reversal of 678623 is 326876.

It is not a de Polignac number, because 678623 - 2⁴ = 678607 is a prime.

It is a super-2 number, since 2×678623² = 921058352258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3458 + ... + 3648.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁶⁷⁸⁶²³ is an apocalyptic number.

678623 is a deficient number, since it is larger than the sum of its proper divisors (150817).

678623 is a wasteful number, since it uses less digits than its factorization.

678623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238.

The product of its digits is 12096, while the sum is 32.

The square root of 678623 is about 823.7857731231. The cubic root of 678623 is about 87.8771961313.

The spelling of 678623 in words is "six hundred seventy-eight thousand, six hundred twenty-three".