677872781 has 2 divisors, whose sum is σ = 677872782. Its totient is φ = 677872780.

The previous prime is 677872757. The next prime is 677872801. The reversal of 677872781 is 187278776.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581243881 + 96628900 = 24109^2 + 9830^2 .

It is a cyclic number.

It is not a de Polignac number, because 677872781 - 2⁶ = 677872717 is a prime.

It is a super-2 number, since 2×677872781² = 919023014441347922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677874781) 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 as a sum of consecutive naturals, namely, 338936390 + 338936391.

It is an arithmetic number, because the mean of its divisors is an integer number (338936391).

Almost surely, 2^677872781 is an apocalyptic number.

It is an amenable number.

677872781 is a deficient number, since it is larger than the sum of its proper divisors (1).

677872781 is an equidigital number, since it uses as much as digits as its factorization.

677872781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1843968, while the sum is 53.

The square root of 677872781 is about 26035.9901098460. The cubic root of 677872781 is about 878.4480138918.

The spelling of 677872781 in words is "six hundred seventy-seven million, eight hundred seventy-two thousand, seven hundred eighty-one".