677731 has 4 divisors (see below), whose sum is σ = 679672. Its totient is φ = 675792.

The previous prime is 677717. The next prime is 677737. The reversal of 677731 is 137776.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 677731 - 2¹⁹ = 153443 is a prime.

It is a super-2 number, since 2×677731² = 918638616722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 677693 and 677702.

It is not an unprimeable number, because it can be changed into a prime (677737) 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, 285 + ... + 1198.

It is an arithmetic number, because the mean of its divisors is an integer number (169918).

2⁶⁷⁷⁷³¹ is an apocalyptic number.

677731 is a deficient number, since it is larger than the sum of its proper divisors (1941).

677731 is a wasteful number, since it uses less digits than its factorization.

677731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940.

The product of its digits is 6174, while the sum is 31.

The square root of 677731 is about 823.2441922054. The cubic root of 677731 is about 87.8386765466.

The spelling of 677731 in words is "six hundred seventy-seven thousand, seven hundred thirty-one".