672779 has 2 divisors, whose sum is σ = 672780. Its totient is φ = 672778.

The previous prime is 672767. The next prime is 672781. The reversal of 672779 is 977276.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672779 is a prime.

It is a Sophie Germain prime.

Together with 672781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (672799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336389 + 336390.

It is an arithmetic number, because the mean of its divisors is an integer number (336390).

2⁶⁷²⁷⁷⁹ is an apocalyptic number.

672779 is a deficient number, since it is larger than the sum of its proper divisors (1).

672779 is an equidigital number, since it uses as much as digits as its factorization.

672779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37044, while the sum is 38.

The square root of 672779 is about 820.2310650055. The cubic root of 672779 is about 87.6242154165.

The spelling of 672779 in words is "six hundred seventy-two thousand, seven hundred seventy-nine".