677998813 has 2 divisors, whose sum is σ = 677998814. Its totient is φ = 677998812.

The previous prime is 677998787. The next prime is 677998817. The reversal of 677998813 is 318899776.

677998813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461261529 + 216737284 = 21477^2 + 14722^2 .

It is a cyclic number.

It is not a de Polignac number, because 677998813 - 2²¹ = 675901661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677998817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338999406 + 338999407.

It is an arithmetic number, because the mean of its divisors is an integer number (338999407).

Almost surely, 2^677998813 is an apocalyptic number.

It is an amenable number.

677998813 is a deficient number, since it is larger than the sum of its proper divisors (1).

677998813 is an equidigital number, since it uses as much as digits as its factorization.

677998813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 58.

The square root of 677998813 is about 26038.4103393429. The cubic root of 677998813 is about 878.5024516873.

The spelling of 677998813 in words is "six hundred seventy-seven million, nine hundred ninety-eight thousand, eight hundred thirteen".