687422833 has 2 divisors, whose sum is σ = 687422834. Its totient is φ = 687422832.

The previous prime is 687422821. The next prime is 687422837. The reversal of 687422833 is 338224786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662702049 + 24720784 = 25743^2 + 4972^2 .

It is a cyclic number.

It is not a de Polignac number, because 687422833 - 2²¹ = 685325681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687422833.

It is not a weakly prime, because it can be changed into another prime (687422837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343711416 + 343711417.

It is an arithmetic number, because the mean of its divisors is an integer number (343711417).

Almost surely, 2^687422833 is an apocalyptic number.

It is an amenable number.

687422833 is a deficient number, since it is larger than the sum of its proper divisors (1).

687422833 is an equidigital number, since it uses as much as digits as its factorization.

687422833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 43.

The square root of 687422833 is about 26218.7496460071. The cubic root of 687422833 is about 882.5540612154.

The spelling of 687422833 in words is "six hundred eighty-seven million, four hundred twenty-two thousand, eight hundred thirty-three".