673778 has 32 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 255744.

The previous prime is 673769. The next prime is 673781. The reversal of 673778 is 877376.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 4448 + ... + 4596.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

2⁶⁷³⁷⁷⁸ is an apocalyptic number.

673778 is a deficient number, since it is larger than the sum of its proper divisors (622222).

673778 is a wasteful number, since it uses less digits than its factorization.

673778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194.

The product of its digits is 49392, while the sum is 38.

The square root of 673778 is about 820.8398138492. The cubic root of 673778 is about 87.6675646191.

The spelling of 673778 in words is "six hundred seventy-three thousand, seven hundred seventy-eight".