677906989 has 2 divisors, whose sum is σ = 677906990. Its totient is φ = 677906988.

The previous prime is 677906927. The next prime is 677907017. The reversal of 677906989 is 989609776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572022889 + 105884100 = 23917^2 + 10290^2 .

It is a cyclic number.

It is not a de Polignac number, because 677906989 - 2¹⁵ = 677874221 is a prime.

It is a super-2 number, since 2×677906989² = 919115771470092242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677906389) 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 as a sum of consecutive naturals, namely, 338953494 + 338953495.

It is an arithmetic number, because the mean of its divisors is an integer number (338953495).

Almost surely, 2^677906989 is an apocalyptic number.

It is an amenable number.

677906989 is a deficient number, since it is larger than the sum of its proper divisors (1).

677906989 is an equidigital number, since it uses as much as digits as its factorization.

677906989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The square root of 677906989 is about 26036.6470383573. The cubic root of 677906989 is about 878.4627902358.

The spelling of 677906989 in words is "six hundred seventy-seven million, nine hundred six thousand, nine hundred eighty-nine".