673777 has 4 divisors (see below), whose sum is σ = 725620. Its totient is φ = 621936.

The previous prime is 673769. The next prime is 673781. The reversal of 673777 is 777376.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156816 + 516961 = 396^2 + 719^2 .

It is a cyclic number.

It is not a de Polignac number, because 673777 - 2³ = 673769 is a prime.

It is a Duffinian number.

673777 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (673747) 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 in 3 ways as a sum of consecutive naturals, for example, 25902 + ... + 25927.

It is an arithmetic number, because the mean of its divisors is an integer number (181405).

2⁶⁷³⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

673777 is a deficient number, since it is larger than the sum of its proper divisors (51843).

673777 is a wasteful number, since it uses less digits than its factorization.

673777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51842.

The product of its digits is 43218, while the sum is 37.

The square root of 673777 is about 820.8392047167. The cubic root of 673777 is about 87.6675212480.

It can be divided in two parts, 67 and 3777, that added together give a square (3844 = 62²).

The spelling of 673777 in words is "six hundred seventy-three thousand, seven hundred seventy-seven".